Question

— Why? Tom, your shirt is so dirty!

   — Mum, I ＿＿ my storeroom downstairs。

A. cleaned      B. have worked    C. was cleaning    D. have been cleaning

Answer 1

D

解析:

現(xiàn)在完成進(jìn)行時表示從過去某時到現(xiàn)在一直在進(jìn)行的動作。