—Theyardissocleantodayandeverythinglooksfine.—Yes.It，sc...

問題詳情：

— The yard is so clean today and everything looks fine.

—Yes. It，s clear that someone       it.

  A. cleans     B. cleaned       C. has cleaned D. was cleaning

【回答】

C

知識點：動詞時態

題型：選擇題