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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单项选择题
The speech ______, a lively discussion started.
A．to deliver
B．be delivered
C．delivering
D．having been delivered
单项选择题
When I try to understand ______ that prevents so many Americans from being so happy as one might expect, it seems to me that there are two causes.
A．why it does
B．what it does
C．what it is
D．why it is
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