单项选择题

Speaker A: Have you had any trouble finding a quiet place to study in
Speaker B: ().

A. Not so sure
B. Not so far
C. Not really
D. Not so bad

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单项选择题
He must have had an accident, or he () then.

A. would have been here
B. had to be here
C. should be here
D. would be here
单项选择题
More than one passenger () killed in the accident yesterday.

A. were
B. had been
C. was
D. has been
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