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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He is ______ help now; he is dying.
A．without
B．beside
C．beyond
D．against
单项选择题
You can't come in, ______ you are.
A．whichever
B．whoever
C．wherever
D．whenever
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