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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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
The speech ______, a lively discussion started.
A．to deliver
B．be delivered
C．delivering
D．having been delivered
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