单项选择题
A.means
B.to mean
C.meaning
D.meant
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单项选择题
A.sinceB.whileC.unlessD.whether
A.since
B.while
C.unless
D.whether
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单项选择题
A.out of sightB.in sightC.by sightD.at sight
A.out of sight
B.in sight
C.by sight
D.at sight
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