单项选择题

— Are you sure you have to It's been very late.
— I don't know （）I can do it if not now.

A. where
B. why
C. when
D. how

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单项选择题
I've never （）him before.

A. heard of
B. hear from
C. heard to
D. hear of
单项选择题
He says that he will （）to me in three days.

A. return the money
B. return back the money
C. get the money back
D. pay back the money
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