单项选择题

The mail was (delayed) for a week because of the flood.

A．held down
B．held in
C．held off
D．held on
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单项选择题
Alex knew that he must (breathe) nothing of this to Nancy.
A．believe
B．talk
C．secret
D．tell
单项选择题
The machine must be operated (by hand). It isn’’t automatic.
A．mentally
B．annually
C．manually
D．heavily
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