—Whyareyourhandsthatdirty?        —Oh,I

問題詳情：

 — Why are your hands that dirty?

         — Oh, I______ in the garden since we finished breakfast.

A. worked                 B. was working          C. am working            D. have been working

【回答】

D

知識點：現在完成時及其被動式

題型：選擇題