____ in these years have we changed the prices of these products.A.Not once B.Two chancesC.Three times D.Once87.141

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____intheseyearshavewechangedthepricesoftheseproducts.A.NotonceB.TwochancesC.ThreetimesD.Once87.141_

____ in these years have we changed the prices of these products.A.Not once B.Two chancesC.Three times D.Once87.141
____ in these years have we changed the prices of these products.
A.Not once B.Two chances
C.Three times D.Once
87.141

____ in these years have we changed the prices of these products.A.Not once B.Two chancesC.Three times D.Once87.141
A.句首为否定形式时句子要用部分倒装.have we changed 使部分倒装形式,因此选A,只有这个是否定的句意:这些年我们不止一次改变了这些产品的价格.once在这里是一次的意思.