Apples are usually sold by __C_weight,and eggs are sometimes sold by ___dozen.

Apples are usually sold by __C_weight,and eggs are sometimes sold by ___dozen.

题目
Apples are usually sold by __C_weight,and eggs are sometimes sold by ___dozen.
A the the B a C the D the a
请高手给个确切的答案,在讲下其中的语法知识,为什么不选B呢,
答案
的确是选C
sell by the dozen 论打出售,这是固定说法
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