单项选择题

It ______ for four days and it hasn't stopped.

A．is raining
B．has been raining
C．has rained
D．had rained
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单项选择题
Take down what I have told you ______ you should forget it.
A．so as to
B．lest
C．suppose
D．unless
单项选择题
My friends will come to my house today, .so I'll have it ______ first.
A．clean
B．cleaning
C．cleaned
D．to be cleaned
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