单项选择题

His ears are highly sensitive () any unusual sound in the machine.

A. of
B. on
C. to
D. by

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单项选择题

The forest fire caused by the volcano is difficult to be ().

A. put off
B. put away
C. put out
D. put up

单项选择题

She is very careful. She () very few mistakes in her work.

A. does
B. rakes
C. makes
D. gets

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