单项选择题

Don't let ______ that you know me. I want to keep it secret.

A．on
B．up
C．down
D．go
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单项选择题
The problems lies ______ the social injustices in this country.
A．in
B．to
C．with
D．down
单项选择题
I am used ______ by air and only on one occasion have I ever felt frightened.
A．to travel
B．to traveling
C．traveling
D．to have traveled
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