单项选择题

By next week the new regulations ().

A. will introduce
B. are to introduce
C. are to be introduced
D. will have introduced

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

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