单项选择题

I tried to get out of the business（）I found impossible to carry on.

A. why
B. which
C. what
D. where

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单项选择题
it’s high time（）firm measures to protect our environment.

A. we take
B. we’ll take
C. we had take
D. we took
单项选择题
He is young and inexperienced, but he（）any danger.

A. dare
B. do dare
C. dare to
D. will dare
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