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(2013·泰州二模)In the market,vegetables are sold by ________ kil

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(2013·泰州二模)In the market,vegetables are sold by ________ kilogram,I mean,by ________ weight.
A.the;/ B./;/ C.the;the D./;the
A

介词by表示“以……计”时,若后接单数可数名词,其前要用定冠词。如: by the week,按周;by the ton按吨,by the meter按米;若后接抽象名词时,则通常不用冠词,如by cash用现金;by volume按体积。