单项选择题

It was while she was sleeping in her bedroom ______ a thief broke into the house.

A. which
B. that
C. where
D. than
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单项选择题
There was a heavy fog this morning, so none of the planes could（）

A. get through
B. take off
C. pull out
D. break away
单项选择题
What are the essential differences ______ selling and marketing
A. between
B. from
C. among
D. for
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