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

試題分析： have/has+動(dòng)詞過(guò)去分詞，構(gòu)成現(xiàn)在完成時(shí)，Bob是第三人稱單數(shù)，用has+過(guò)去分詞。sweep的過(guò)去分詞為swept。句意：鮑勃自己打掃了臥室，看，多干凈啊！故選C。
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