单项选择题

() evidence that language-acquiring ability must be stimulated.

A. It being
B. It is
C. There is
D. There being

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Studies reveal that people spend two hours dreaming every night, no matter what they()during the day.

A. should do
B. would have done
C. may have done
D. must do
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Are there any stationers in this street None()I know of.

A. that
B. which
C. what
D. how
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