单项选择题

______ your work in case you've made any mistakes.

A．Take care of
B．Ensure
C．Look out for
D．Check
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单项选择题
I would appreciate ______ it a secret.
A．your keeping
B．that you keep
C．you to keep
D．that you will keep
单项选择题
My car broke ______ on the way to work so I was late.
A．up
B．down
C．off
D．into
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