单项选择题
Since the road is wet this morning, ______last night.
A．it must rain
B．it must be mining
C．it must have rained
D．it must have been rain
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单项选择题
It was in the winter of 1951______a heavy fog moved into London.
A．that
B．then
C．when
D．/
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单项选择题
The salary of an engineer is much higher______.
A．than a teacher
B．than that of a teacher
C．in comparison with a teacher’s
D．than of a teacher’s
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