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單項(xiàng)選擇題

It's our duty to preserve the planet for future（）

A.persons
B.generations
C.characters
D.nations

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單項(xiàng)選擇題

I don't think I will ever feel（）spreading rumors.

A.consistent
B.common
C.comfortable
D.comparable

單項(xiàng)選擇題

If you're coming, please let me know（）advance.

A.at
B.in
C.by
D.on

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