单项选择题

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

A. is
B. most wide
C. method
D. preservation

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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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Although the danger that he might be injured, Smith bravely entered the burning house in order to save the boy.().

A. Although
B. be injured
C. bravely entered
D. in order

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