i ---(watch)TV when my parents came back
问题描述:
i ---(watch)TV when my parents came back
答
was watching
原句的意思:当我父母回来时,我正在看电视.
空里的时态是过去进行时,表示过去正在发生的事情,be动词am要变为过去式was,故空里填was watching.