单项选择题

There is no light in the dormitory. They must have gone to the lecture, ______

A．didn't they
B．don't they
C．mustn't they
D．haven't they
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单项选择题
Although he has lived with us for years, he ______ us much impression.
A．hadn't left
B．didn't leave
C．doesn't leave
D．hasn't left
单项选择题
______, some famous scientists have the qualities of being both careful and careless.
A．Strangely enough
B．Enough strangely
C．Strange enough
D．Enough strange
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