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

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