单项选择题

Alex knew that he must (breathe) nothing of this to Nancy.

A．believe
B．talk
C．secret
D．tell
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单项选择题
The machine must be operated (by hand). It isn’’t automatic.
A．mentally
B．annually
C．manually
D．heavily
单项选择题
He had been (forced) to give up much of his time to housework.
A．compelled
B．demanded
C．determined
D．required
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