单项选择题

By the time I got to the office, the emergency meeting ______.

A. began

B. has begun
C. had begun

D. was beginning
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单项选择题
A. It seems too small. B. It costs $145.C. The suit fits very well. D. This is the last one.
A. It seems too small.
B. It costs $145.
C. The suit fits very well.
D. This is the last one.
单项选择题
John is busy ______ his girlfriend ______ her paper.
A. help... with
B. to help... with
C. helping... with
D. to help... /
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