单项选择题

He demanded that we explain why things went wrong,（）

A. hadn't we
B. hadn't he
C. didn't we
D. didn't he

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The second book was （） by August, but several months later, its publication was still nowhere in sight.

A. completed
B. to complete
C. to have completed
D. to have been completed
单项选择题
The student is different （） all the students I have seen.

A. on
B. among
C. with
D. from
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