单项选择题

Peter didn't understand the problem until I ______ him.

A．advised
B．acquainted
C．enlightened
D．communicated
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单项选择题
She wasn't feeling very well; otherwise, she ______the meeting so early.
A．wouldn't leave
B．wouldn't have left
C．didn't leave
D．hadn't left
单项选择题
The reason ______ I'm writing is to tell you about my exam results.
A．because
B．as
C．why
D．for
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