【題目】They seem ______ what they are doing.

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

【答案】B

【解析】

句意:他們似乎知道自己在做什么。A. knew過去式,知道;B. to know動(dòng)詞不定式; C. knowing現(xiàn)在分詞或動(dòng)名詞;D. know動(dòng)詞,知道。seem動(dòng)詞,似乎、好像;根據(jù)seem to do似乎做某事,可知使用動(dòng)詞不定式形式。故選:B。

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