单项选择题

The homework is clue the first thing Monday morning, so make sure ______to the deadline (最后期限).

A．keeping
B．you'll keep
C．for keeping
D．you keep
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单项选择题
—Was the driving pleasant when you vacationed in Mexico (墨西哥) last summer —No, it______ for four days when we arrived so that the roads were very muddy.
A．was raining
B．had been raining
C．would be raining
D．have rained
单项选择题
I don't think Jim saw me, he ______ into space.
A．has just looked
B．just looked
C．had just looked
D．was just looking
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