单项选择题

They didn't go to the park last Saturday ______ it was raining hard.

A． that
B． while
C． because
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单项选择题
Grandmother is ill. We must ______ a doctor.
A． send away
B． send off
C． send for
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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