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Bob ______ his bedroom by himself. Look! How clean it is!
A. sweeps                  B. swept                    C. has swept   
C

试题分析: have/has+动词过去分词,构成现在完成时,Bob是第三人称单数,用has+过去分词。sweep的过去分词为swept。句意:鲍勃自己打扫了卧室,看,多干净啊!故选C。
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