单项选择题

Having finished his term paper before the deadline, it was delivered to the professor before the class.()

A. finished
B. before the deadline
C. it was delivered
D. before

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Canning is the most wide used method of food preservation.()

A. is
B. most wide
C. method
D. preservation
单项选择题
Prior to our conference, the executive director had requested that everyone was well prepared.()

A. Prior to
B. conference
C. executive
D. was
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