单项选择题

I don’t know about him, ______ comment on him behind his back.

A. let alone
B. let go
C. leave alone
D. take leave
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单项选择题
It was when she was about to go to bed while the telephone rang.
A. when
B. about
C. to go
D. while
单项选择题
His doctor insists ______ for a few days.
A. that he is resting

B. his resting
C. him to rest

D. that he rest
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