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
No case is on record of a ______ being ceasing to be ______ under cultivation.
A．variable,variant
B．variant,variable
C．varied,various
D．variable,variable
单项选择题
He cast but a ______ glance upon the single solider that stood guard.
A．leisure
B．casual
C．spare
D．relaxed
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