单项选择题

Obviously, the Chairman's remarks at the conference were _________ and not planned.

A．substantial
B．spontaneous
C．simultaneous
D．synthetic
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单项选择题
The reason for the traffic accident was _________ one of the drivers had lost control of his car.
A．why
B．when
C．that
D．how
单项选择题
_________ is often the case with a new idea, much preliminary activity and optimistic discussion produced no concrete proposals.
A．That
B．It
C．this
D．As
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