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Soory!I did not notice you entering the room because I _____

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Soory!I did not notice you entering the room because I _____ a phone call.
answered
has answered
was answering
has been answering
还有didn’t写成did not有错吗?
干嘛不选has been answering?
Soory!I did not notice you entering the room because I _____
was answering 表示你进来时我正在接电话
再问: has been answering呢?
再答: 不对的,主句是一般过去时,用had been answering
再问: 如果是had been answering呢? 还有didn’t写成did not有错吗?
再答: 没错