单项选择题

It's reported by some scientists that physical surroundings ______ people's emo-tional reactions.

A．affect
B．infect
C．effect
D．defect
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单项选择题
It's no use ______ any longer. He may come by any bus.
A．waiting
B．to wait
C．having waited
D．to have waited
单项选择题
The other day your cousin came to visit us without giving notice ______.
A．in addition
B．in advance
C．in fact
D．in nature
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