【題目】They seem _____ what they are doing.

A. knew B. to know C. knowing

【答案】B

【解析】

句意:他們似乎知道他們在做什么。考查動詞不定式。短語seem to do sth.:似乎做某事,好像做某事;結(jié)合句意可知選B。

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