--Mother hasn’t come back yet.--Well, she ought . A. to B. to be C. to do D. to

--Mother hasn’t come back yet.

--Well, she ought ____.

  A. to                B. to be            C. to do           D. to have

试题答案

D.

解析：ought to have done sth.表示应该做某事而实际没做，这里省去了过去分词come.但助动词have 不能省。