单项选择题

I was halfway back to the cottage where my mother lived _________ Susan caught up with me.

A．when
B．while
C．until
D．though
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单项选择题
The old gentleman was a very _________ looking person, with grey hair and gold spectacles.
A．respectful
B．respected
C．respective
D．respectable
单项选择题
After several nuclear disasters, a _________ has raged over the safety of nuclear energy.
A．quarrel
B．suspicion
C．verdict
D．controversy
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