单项选择题

All the students finished the test （） the given time.

A. at
B. by
C. till
D. within

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单项选择题

The students, ()at the way the questions were put, didn’t know the answers to them.

A. surprise
B. surprising
C. having surprised
D. surprised

单项选择题

This was the first time （）I had serious trouble with my boss.

A. since
B. that
C. with
D. when

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