单项选择题

The teacher didn't begin the class()all the students ().

A.until, stopped talk
B.before, stopped talking
C.while, stopped to talk
D.because, stopped talking

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These windows need (). Can you help me with this

A.clean
B.cleaning
C.to clean
D.cleaned
单项选择题
—The final exam is coming! I'm so nervous． — (), Mary. It's not the end of the world.

A.Take it easy
B.Take care
C.Be careful
D.Be yourself
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