In the market, vegetables are sold by _______ kilogram, I mean, by _______ weight.
A．the; 不填B．不填; 不填
C．the; theD．不填；the
A
選A。介詞by表示“以…計(jì)”時(shí)，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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