单项选择题

We are kept ______ by clean air.

A．health
B．healthy
C．healthily
D．to be healthy
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单项选择题
It rained(continue) ______the whole day yesterday
It rained(continue) ______the whole day yesterday
单项选择题
Would you like______, please
A．two glass of water
B．two glasses of water
C．two glass of waters
D．two glasses of waters
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