单项选择题

Only years later ______ the truth about the matter.

A．I learned
B．did I learn
C．I did learn
D．had I learned
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单项选择题
______ cold and windy, most people stayed indoors.
A．Being
B．It was
C．It being
D．Having been
单项选择题
I______ until he told me to.
A．left
B．didn't leave
C．hadn't left
D．would leave
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