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 cookingC．had cooked D．would cook
C
在英文中用by the time構(gòu)成的從句修飾主句，主句通常用過(guò)去完成時(shí)，結(jié)構(gòu)為had+過(guò)去分詞，故本題選C。
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