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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单项选择题
(In spite of) the wonderful music, sensitive photography, and (well-developed) plot, the (three-hours) play could not (hold) our attention.
A．In spite of
B．well-developed
C．three-hours
D．hold
单项选择题
(White and black) light, (if mixing) (in) the right proportion, (will show) us grey.
A．White and black
B．if mixing
C．in
D．will show
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