单项选择题
A.survive
B.sustain
C.keep
D.maintain
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单项选择题
A.inB.forC.atD.of
A.in
B.for
C.at
D.of
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单项选择题
A.haveB.hasC.hadD.have had
A.have
B.has
C.had
D.have had
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