1.It rained hard yesterday, ______ prevented me from going to the park.
A. that　
B. which　　
C. as　
D. it

2.______ a little earlier, I would have caught the train.
A. Did I leave
B. Would I leave
C. Had I left
D. Have I left

3.It _______ me three years to draw the beautiful horses.
A. took
B. paid　　
C. spent
D. cost

4.He was ______ to withdraw from running for the presidency.
A.trusted
B.credited
C.convinced
D.believed
5.I wished it ______ but it did．
A. had not occurred
B. occurred not
C. did not occur
D. would not occur

6.The boy complained _______ a pain in his stomach.
A. with
B. for
C. in
D. of

7.The meeting _____ next week will be of great importance.
A. to be held
B. held
C. holding
D. is held

8.Is it Shakespeare Theatre _______ you are going to watch the play The Merchant of Venice?
A. where
B. that
C. which
D. as

9.Two-thirds of his property ______ lost in the fire.
A. was
B. were
C. are
D. have been

10.Very few people understood this contract, ______ was very obscure.
A. the language
B. the language of which
C. all it said
D. which it had said

11.Water is composed _______ hydrogen and oxygen.
A. of
B. with
C. for
D. about

12.The new discovery _______ be of great service to mankind.
A. is bound to
B. is bound for
C. be bound to
D. be bound for

13.Look at this group of people ______ beach volleyball.
A. played
B. is played
C. playing
D. is playing

14.Sickness often _______ eating too much.
A. as a result of
B. result of
C. result in
D. result from

15.They prefer to _______ the rest of the morning walking in the garden.
A. spending
B. spent　　
C. be spending
D. spend

16.Charles Smith, ______ was my former teacher, retired last year.
A. which
B. who
C. that
D. as

17.The two girls competed with each other ______ the highest mark.
A. for
B. with
C. to
D. against

18.Sarah hopes to become a friend of ______ shares her interests.
A. anyone
B. whomever
C. whoever
D. no matter who

19.Please remind me _______ her this note.
A. leave
B. to leave
C. leaving
D. left

20.It is important to ________ your skin from the harmful strong sunlight．
A．protect
B．prevent
C．stop 　
D．keep

我来回答，你看着办，很累的，不过答案我不确定哎！呵呵！
一：B:which指代前面整个句子，that不能引导非限定性定语从句
二：C：if引导的虚拟语气，省略if，had提前
三：A： it take sb +time+to do 固定搭配
四：C：他被确信必会退出总统选举
五：A:WISH 的虚拟语气，对过去假设
六：D:complain of或complain about抱怨
七：A：非谓语动词，to be done 表示即将发生的
八：A:地点状语，in which===where！
九：B：分式，谓语复数，其他表示失去的状态
十：B：很少人理解那个合同，因为语言模糊，先行词是contract
十一：A： be composed of固定搭配，由...构成，水分子由氢氧原子构成！
十二：A:那一项新发现对人类作出重大贡献
十三：C：非谓语动词，表示主动形式
十四：D：疾病由于多吃而引起的，C：表示导致，D：原因追究为
十五：D:prefer to do
十六：B定语从句作插入语
十七：A：为……竞争
十八：C：他想成为任何一个愿意分享他爱好的人的朋友！
十九：B：remind sb to do提醒我给他留下笔记
二十:A：:表示保护……不受……伤害