问题
选择题
By the time my parents reached home yesterday, I _____ the dinner already.
A．had cooked
B．cooked
C．have cooked
D．was cooked
答案
答案：A
在英文中有by the time构成的时间状语从句，主句通常用过去完成时，结构为had+过去分词，故本题选A。
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