I was doing my homework while my parents __________ TV last night.
A．watchedB．were watchingC．have watchedD．a(chǎn)re watching
B
本題的含義是昨天晚上我正在做作業(yè)的時候，我的父母在看電視的事應該正在進行，所以while引導的從句用過去進行時，結構為be+doing，主語是復數(shù)，be用were，故本題選B。
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