单项选择题

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

A.clean
B.cleaning
C.to clean
D.cleaned

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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
单项选择题
The manager required that all the employees () at the office on time．

A.will arrive
B.arrive
C.arrived
D.have arrived
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