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
The politician urged that all citizens ______ to the polls on election day.
A．had gone
B．went
C．must go
D．go
单项选择题
Every means______since then.
A．has been trying
B．have been trying
C．have been tried
D．has been tried
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