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
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单项选择题
He delivered （） orders for a Chinese restaurant for the whole summer vacation so as to earn enough money for his tuition.

A. take-off
B. take-over
C. take-up
D. take-out
单项选择题
He has been asked to account ______ his absence.
A. for
B. on
C. of
D. about
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