By the time my parents returned home yesterday,I______the dinner already.A had cooked B cooked C have cooked D must be reported 请说明原因

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Bythetimemyparentsreturnedhomeyesterday,I______thedinneralready.AhadcookedBcookedChavecookedDmustber

By the time my parents returned home yesterday,I______the dinner already.A had cooked B cooked C have cooked D must be reported 请说明原因
By the time my parents returned home yesterday,I______the dinner already.
A had cooked B cooked C have cooked D must be reported 请说明原因

By the time my parents returned home yesterday,I______the dinner already.A had cooked B cooked C have cooked D must be reported 请说明原因
A
句子中有By the time ,用过去完成时