单项选择题
A.are
B.couldn't
C.always
D.never
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单项选择题
A.skyB.atmosphereC.oxygenD.environment
A.sky
B.atmosphere
C.oxygen
D.environment
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单项选择题
A.oughtB.couldC.willD.must
A.ought
B.could
C.will
D.must
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