单项选择题

So little _____ about philosophy that the lecture was completely beyond him.

A．did Tom know
B．does Tom know
C．Tom knew
D．Tom knows
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单项选择题
The ground is wet; it _____ last night.
A．might have been raining
B．can have rained
C．must have rained
D．should have rained
单项选择题
Mary is never late for class, _____
A．doesn’t she
B．isn’t she
C．does she
D．is she
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