题目内容
My mother ______when I got home.
| A．cook | B．cooking | C．was cooking | D．cooks |
C
解析试题分析：句意：当我到家时，我母亲正在做饭。根据时间状语从句when I got home.可知这是过去时，因此此处过去进行时。故选C。
考点：考查时态的用法。
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