单项选择题

The officer gave an order that everyone () back before dark.

A. get
B. would get
C. had to get
D. must get

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单项选择题
In this thing, he has no () of right and wrong.

A. thought
B. idea
C. concept
D. notion
单项选择题
The investigation, () will soon be published, was made by Professor Smith.

A. at which the results
B. the resuhs on which
C. of whose results
D. whose results
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