单项选择题

It () quite hard－perhaps we shouldn’t go out tonight.

A、snows
B、is snowing
C、snowed
D、had snowed
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单项选择题
() I ‘ve been without a car for most of my life, I’ve always managed to get about as much as I’ve wanted.
A、although
B、however
C、so that
D、yet
单项选择题
I () before I sold it.
A、paints the house
B、had painted the house
C、have been painting the house
D、had been painting the house
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