单项选择题

______I was going out, it began to rain.

A．When
B．While
C．As
D．Since
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单项选择题
She talks and acts as if she ______ a monitor now.
A．would be
B．was
C．be
D．were
单项选择题
The passengers and the suitcases ______ were still waiting had to be transferred to another plane.
A．which
B．that
C．who
D．whom
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