单项选择题

Let's ask him for help, ().

A. don't we
B. shall we
C. have we
D. haven't we

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单项选择题
This is a very () situation and we don't know how to face it yet.

A. comprehensive
B. compound
C. complicated
D. competent
单项选择题
It wasn't such a good dinner () she had promised us.

A. that
B. as
C. which
D. what
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