In the market, vegetables are sold by _______ kilogram, I mean, by _______ weight.

A. the; 不填       B.不填; 不填  C. the; the            D.不填；the

A


解析:

介詞by表示“以…計”時，若后接單數(shù)可數(shù)名詞，其前要用定冠詞，如：by the week 按周，按星期 / by the ton 按噸 / by the yard 按碼 / by the meter 按米；若后接抽象名詞，則通常不用冠詞，如：by volume 按體積 / by weight 按重量。

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