Question

【题目】They seem _____ what they are doing.

A. knew B. to know C. knowing

Answer 1

【答案】B

【解析】

句意：他们似乎知道他们在做什么。考查动词不定式。短语seem to do sth.：似乎做某事，好像做某事；结合句意可知选B。