单项选择题

Not until quite recently ______ he gave up his plan to go abroad.

A．I knew
B．I had known
C．did I know
D．I did know
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Stop ______,boys! It's time for class.
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B．to talk
C．talk
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I would rather you ______ those important files with you.
A．not take
B．didn't take
C．won't take
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