单项选择题

He __________ into the office building when the fire bell rang.

A． goes
B． has gone
C． was going
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单项选择题
There are big trees on __________ side of the quiet street.
A． both
B． either
C． any
单项选择题
—Will you come for the meeting— Yes, of course, if you think
A． I come
B． I go
C． I should
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