单项选择题

It was ______ I met Mr. Green in Shanghai.

A．many years that
B．many years before
C．many years ago that
D．many years when
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单项选择题
She didn't know ______ , because she had never done it.
A．how to do it
B．to do it
C．doing it
D．how will do it
单项选择题
The boy looked at the stranger carefully, ______ who he could be.
A．to wonder
B．wondering
C．wondered
D．having wondered
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