单项选择题

The speech (), a lively discussion started.

A. to deliver
B. be delivered
C. delivering
D. having been delivered

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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
单项选择题
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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