12.--- Why?Tom,your shirt is so dirty!　　--- Mum,I ______ my store_英语解答

12.--- Why?Tom,your shirt is so dirty!
　　--- Mum,I ______ my storeroom downstairs.
　　A.cleaned B.have cleaned C.was cleaning D.have been cleaning
这题怎么选,为什么

人气：437 ℃　时间：2019-10-11 19:23:23

解答

D,表示过去的那段时间一直在打扫,而且有对现在的影响