单项选择题
A.at
B.in
C.on
D.under
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单项选择题
A.knivesB.facilitiesC.scalpelsD.appliances
A.knives
B.facilities
C.scalpels
D.appliances
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单项选择题
A.inB.byC.onD.under
A.in
B.by
C.on
D.under
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