题目内容

I was doing my homework while my parents __________ TV last night.
A．watchedB．were watchingC．have watchedD．are watching
B
本题的含义是昨天晚上我正在做作业的时候，我的父母在看电视的事应该正在进行，所以while引导的从句用过去进行时，结构为be+doing，主语是复数，be用were，故本题选B。
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