单项选择题


A.valid
B.enormous
C.various
D.proper
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单项选择题
A.put up withB.keep up withC.come up withD.catch up with
A.put up with
B.keep up with
C.come up with
D.catch up with
单项选择题
A.earthB.atmosphereC.spaceD.environment
A.earth
B.atmosphere
C.space
D.environment
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