单项选择题
It ______ yesterday. The ground is still wet now.
A．must have rained
B．was raining
C．rained
D．had rained
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单项选择题
This book costs ______ that one.
A．twice more
B．twice more as
C．two times more as
D．twice as much as
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单项选择题
The old in the country ______ taken good care of.
A．have
B．has
C．is
D．are
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