单项选择题

It is necessary that an efficient worker _______ his work on time.

A．accomplishes
B．can accomplish
C．accomplish
D．has accomplished
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单项选择题
China started its space industry only in recent years, and should _______ no lime in catching up.
A．delay
B．lag
C．lessen
D．lose
单项选择题
Then the _______ streamed into tire great hall.
A．group
B．crowd
C．gang
D．masses
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