B3. __________ now seems impossible.
A. Saving money B. To save money
C. Being saved money D. To be saved money
(为什么不选A)

B6. It was polite _________ the child to give up his seat to the elderly woman.
(为什么不选A)
A. for B. of C. to D. with

B14. I don’t remember __________ about it.
A. him telling us B. his telling us
C. him to tell us D. he tells us
(为什么还是不选A)

B5.There was terrible noise ______ the sudden burst of light.(MET)
A. followed B. following C. to be followed D. being followed
(我是凭感觉蒙对的,用语法怎么讲啊)

D18.——Did you hear her ______ this pop song this time the other day?
——Yes, and I heard this song ______ in English.
A. sing; singing B. sung; sung C. sung; singing D. singing; sung
(第一个空为什么不用sing？this time the other day是正在进行的状态吗)

D22.Her husband died in 1980 and had nothing ______ to her, only ______ her five
children.
A. left; to leave B. leaving; leaving C. leaving; left D. left; leaving
（不太懂，第一个是had done形式吗？第二个怎么讲，结果状语吗？）

C26.I saw some villagers ______ on the bench at the end of the room.
A. seating B. seat C. seated D. seated themselves
（用感官动词的语法讲为什么选C而不选A呢？）

B35.——I hope the children won’t touch the dog.
——I’ve warned them ______ .
A. not B. not to C. not touch D. not do
（为什么不是not to do）

D39.He was often listened ______ in the next room.
A. sing B. sung C. to sing D. to be sing
（完全不懂）

详细解释一下~谢谢啦~

B3. __________ now seems impossible.
动名词短语和不定式短语都能做主语，但动名词通常表示经常性的动作，此句中有now则表明特别的情况，一时的情况，因此选B不选A。

B6. It was polite _________ the child to give up his seat to the elderly woman.
本句的意思是：这孩子将座位让给老太太很有礼貌。在表示一个人的性格品质时如：polite礼貌的，kind好心的，generous慷慨的等，句型应该用：It's + 形容词 + of (sb.）+ do sth. 不同于important，necessary等形容词，of 要换成for。

B14. I don’t remember __________ about it.
remember后跟动名词作宾语，his是动名词的逻辑主语，A的用法不正确。

B5.There was terrible noise ______ the sudden burst of light.(MET)
选B。现在分词，相当于定语从句which followed。noise是动作发出者，表主动，所以要用现在分词。

D18.——Did you hear her ______ this pop song this time the other day?
——Yes, and I heard this song ______ in English.
因为有了this time (前几天的)这个时间段，所以用现在分词，表示进行的状态。

D22.Her husband died in 1980 and had nothing ______ to her, only ______ her five children.
选D。前者left是过去分词，作定语，相当于“that was left"，nothing是left的承受者；后者leaving表示她丈夫留给她，是一种主动的行为，故用现在分词，应该看作伴随状语。


C26.I saw some villagers ______ on the bench at the end of the room.
seat是及物动词，一般说seat oneself或be seated, 因此选C，而不选A。（比较：I saw him sitting on the bench... sit为不及物动词，用现在分词。）

B35.——I hope the children won’t touch the dog.
——I’ve warned them ______ .
如果为not to do，do后需加宾语，如that。

D39.He was often listened ______ in the next room.

listen是感官动词，其他的词还有hear, watch, see, notice等。在主动语态中，说"听到/看到某人做某事：hear/see sb. do sth.，省去不定式的to,但用在被动语态中，则须恢复to.因此应选C。但listen通常是不及物动词，此句将其用作及物动词了。