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
The rain was very ______ yesterday.
A． large
B． strong
C． heavy
单项选择题
I'II write back as soon as I ______ your letter.
A． will get
B． get
C． have got
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