单项选择题

______ what to do, the man telephoned the police.

A. Not known
B. Not knowing
C. Don't know
D. Knowing not
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单项选择题
When you ______ back to Beijing next month, let me know the exact date.
A. will come
B. had come
C. be coming
D. come
单项选择题
I missed the morning train because I slept ______.
A. over
B. of
C. in
D. through
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