单项选择题
A.which
B.that
C.when
D.what
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单项选择题
A.owingB.owningC.operatingD.repairing
A.owing
B.owning
C.operating
D.repairing
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单项选择题
A.operationB.acquisitionC.reservationD.maintenance
A.operation
B.acquisition
C.reservation
D.maintenance
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