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【题目】They seem ______ what they are doing.

A. knew B. to know C. knowing D. know

【答案】B

【解析】

句意:他们似乎知道自己在做什么。A. knew过去式,知道;B. to know动词不定式; C. knowing现在分词或动名词;D. know动词,知道。seem动词,似乎、好像;根据seem to do似乎做某事,可知使用动词不定式形式。故选:B。

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