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
I really don't know ______.
A．to skate
B．how to skate
C．to skate how
D．how skate
单项选择题
She talks and acts as if she ______ a monitor now.
A．would be
B．was
C．be
D．were
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