Question

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

Answer 1

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。