单项选择题


A．Should
B．Must
C．Would
D．Need
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单项选择题
A．testB．problemC．paperD．lesson
A．test
B．problem
C．paper
D．lesson
单项选择题
It is (necessary) that she (comes) here twice a week (to help) (do) the housework.
A．necessary
B．comes
C．to help
D．do
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