单项选择题

Since the ground is wet, it ______ last night.

A．must rain
B．must have rained
C．had rained
D．rained
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单项选择题
She was happy ______ with her aunt since she was five years old.
A．having stayed
B．having been staying
C．to stay
D．to have been staying
单项选择题
______ the result, I would not have asked you to tell me.
A．If I know
B．Had I known
C．I had known
D．If I knew
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