Why are your clothes so dirty Mike?Because I___the classroom A.have cleaned B.cleanedC.was cleaning求详解

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Why are your clothes so dirty Mike?Because I___the classroom A.have cleaned B.cleaned
C.was cleaning
求详解

A
回答是“因为我刚打扫完房间”用完成时

啊,因为was cleaning 是进行时态,所以选C。