单项选择题

Mother insisted that ______.

A．they are to be back before nine in the evening
B．they ought to be back before nine in the evening
C．they be back before nine in the evening
D．they had to be back before nine in the evening
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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
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
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