单项选择题

Listen! Someone ______in the next room.

A． cries
B． is crying
C． crying
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单项选择题
I'll write back as soon as I______ your letter.
A． will get
B． get
C． have got
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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