单项选择题
A.is being
B.are
C.have been
D.is
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单项选择题
A.overB.outC.offD.for
A.over
B.out
C.off
D.for
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单项选择题
A.knowingB.to knowC.they knowD.known
A.knowing
B.to know
C.they know
D.known
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