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

The sale usually takes place outside the house, with the audience （） on benches, chairs or boxes.

A. having seated
B. seating
C. seated
D. having been seated

单项选择题

My sister’s professor had her （） her paper many times before allowing her to present it to the committee.

A. rewritten
B. to rewrite
C. rewrite
D. rewriting

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