问题

Please e—mail Jack _____ jacksmith@sina.com.
A:in
B:at
C:to
D:of;
B:at
C:to
D:of;
正确答案是:
同类题型
I would have come to see you earlier, but I __________ too busy.
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w library, ______ last week, isvery popular _____ the students
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