单项选择题

We have done things we ought to have undone and （） undone things we ought to have done.

A. leaving
B. left
C. will leave
D. leave

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单项选择题
(31) （）

A. to
B. around
C. with
D. for
单项选择题
The US and the EC should reach a new world trade agreement （）.

A. in three weeks’ time
B. this week
C. next Wednesday
D. in a couple of days
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