单项选择题

Because of the high blood pressure, the doctor advised him to ______ from smoking.

A．constrain
B．restrain
C．refrain
D．remain
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单项选择题
It is reported that the factory's new assembly line ______ next year will increase its output by at least 30%.
A．to complete
B．completed
C．being completed
D．to be completed
单项选择题
He felt like a small boat on a(n) ______ ocean.
A．enormous
B．huge
C．gigantic
D．vast
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