i ---(watch)TV when my parents came back

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i ---(watch)TV when my parents came back

i ---(watch)TV when my parents came back
i ---(watch)TV when my parents came back

i ---(watch)TV when my parents came back
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.