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
Lily went to see her grandpa yesterday, ______ he was ill.
A．if
B．though
C．because
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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