题目内容
I thought I ____ the door, but it is still open．
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Why weren’t you at the meeting? I ____ an important visitor from the UK in my office.
I have no idea what ____ while I was asleep.
I ___ so busily recently that I ______ no time to help you with your math. That’s OK. I can manage it by myself.
He ____ at the meeting, but his heart attack prevented him.
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