—Why are your shoes so dirty?-Because I ( ) the classroom.A.cleaned B.have cleaned C have been D.was cleaning

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—Why are your shoes so dirty?-Because I ( ) the classroom.A.cleaned B.have cleaned C have been D.was cleaning
—Why are your shoes so dirty?-Because I ( ) the classroom.
A.cleaned B.have cleaned C have been D.was cleaning

—Why are your shoes so dirty?-Because I ( ) the classroom.A.cleaned B.have cleaned C have been D.was cleaning
A
因为“我打扫了教室”应该用一般过去式,而且“Why are your shoes so dirty?”是一般现在时,时态要对应

B