单项选择题

The train arrived twenty minutes late, but we were not told what caused the ______.

A．late
B．delay
C．slow
D．last
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单项选择题
I suggested that a meeting ______ at some other time.
A．holds
B．is holding
C．be held
D．hold
单项选择题
It is dangerous to put iron wire in socket(插座). Which of the following explains why this is so
A．The iron wire picks up electrical charges.
B．The strands begin to bristle with electricity.
C．As rain wet the string, it conducted more electricity.
D．Franklin might have been killed by a bolt of lightenin
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