Why?Tom,your skirt is so dirty!

问题描述:

Why?Tom,your skirt is so dirty!
Mum,I ___ my storeroom downstairs.
A cleaned B have cleaned C was cleaning D have been cleaning
为什么选D不选B呢?

have been doing 表示过去一直在做某事
句子的意思是妈妈问tom的衬衫为什么那么脏
他回答说我一直在楼下打扫储藏室
如果选B则要翻译成:我已经打扫完楼下的储藏室了
与上一句不符,所以选D