单项选择题

-Were the exercises difficult
- Not at all. In fact, I found

A. it very easy to do

B. them very easy to do
C. very easy to do it

D. very easy to do them
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单项选择题
Everybody was looking for you when the meeting was over. You______with-not a word.
A. mustn’t leave

B. shouldn’t have left
C. couldn’t have left

D. needn’t leave
单项选择题
The lectures, ______the current international issues, are well received.
A. are covered
B. covered
C. covering
D. to cover
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