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Why?Tom,your shirt is so dirty!

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Why?Tom,your shirt is so dirty!
  --- Mum,I ______ my storeroom downstairs.
  A.cleaned B.have cleaned
  C.was cleaning D.have been cleaning 
请问原因.
Why?Tom,your shirt is so dirty!
Why?Tom,your shirt is so dirty!
  --- Mum,I ______ my storeroom downstairs.
  A.cleaned B.have cleaned
  C.was cleaning D.have been cleaning 
这道题D是最佳选项.现在完成进行时的意义——从过去某一时间开始到此刻,动作一直有在进行.第一句:衣服这么脏,暗含为什么不去洗的意思;第二句:知道说话的时刻我一直在楼下忙于打扫储藏室,暗含我没有功夫洗.