单项选择题

Quite a lot of people watch TV only to ______ time.

A．waste
B．spend
C．kill
D．while
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单项选择题
As a ______ major, he enjoyed working in the steel plant.
A．metallurgy
B．geology
C．astronomy
D．seismology
单项选择题
The nurse ______ the doctor in the operation room.
A．insisted
B．resisted
C．assisted
D．persisted
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