单项选择题
A.That
B.This
C.It
D.There
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单项选择题
A.cognitionB.concernC.conceptionD.experience
A.cognition
B.concern
C.conception
D.experience
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单项选择题
A.breakB.openingC.intervalD.gap
A.break
B.opening
C.interval
D.gap
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