问题: 英语选择题...
Sorry,I_____ you came back.
A.don't know
B.didn't know
C.haven't known
D.knew
答案是B..为什么?还有为什么came没有用原形?
-If each of us_______ the environment,the
world will become more beautiful.
-I agree with you.
A.take measures to protecting
B.takes measure to protect
C.make a contribution to protecting
D.makes a contribution to protect
答案是Ｂ..可是为什么measure没有加S?
The weather in the north is colder than it
in the south...
为什么用it 不用that？
解答:
Sorry,I_____ you came back.
A.don't know
B.didn't know
C.haven't known
D.knew
选B，因为you came back实际上是一个省略that的宾语从句，时态要和主句的时态一致。
If each of us_______ the environment,the
world will become more beautiful.
-I agree with you.
A.take measures to protecting
B.takes measure to protect
C.make a contribution to protecting
D.makes a contribution to protect
选B，因为前面有each of us，强调的是each是单数，所以要用takes
The weather in the north is colder than it
in the south...
it 指代的是weather，而that 应引导一个从句！
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