By the time my mother came back from work, my sister and I supper and were waiting for her at the t

题目简介

By the time my mother came back from work, my sister and I supper and were waiting for her at the table.

A．have cooked

B．were cooking

C．had cooked

D．would cook

题型：单选题难度：偏易来源：不详

在英文中用by the time构成的从句修饰主句，主句通常用过去完成时，结构为had+过去分词，故本题选C。