题目列表(包括答案和解析)
He was seen _______ (clean) his office at about 5:30, and after that, nobody knows where
he has gone.
根据句子意思，用括号中所给单词的正确形式填空
He was seen ________ his office at about 5∶30, and after that, nobody knows where he has gone．(clean)
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