单项选择题

To drive a car safely, it is ______ good brakes.

A. essential with
B. essential having
C. essential to have
D. essential have
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单项选择题
31().

A.Being
B.For
C.Having
D.As
单项选择题
He ______ have been nervous because he didn’t go straight in.
A. ought to
B. must
C. should
D. had to
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