单项选择题
A.tool
B.machines
C.devices
D.appliances
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单项选择题
A.atB.inC.onD.to
A.at
B.in
C.on
D.to
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单项选择题
A.a wrongB.an oppositeC.a negativeD.a common
A.a wrong
B.an opposite
C.a negative
D.a common
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