Discovery in a South African cave suggests that modern human behavior ____ much earlierthan ____.

A. begin, previously thoughtB. began, previously thought

C. should begin, previous thinkingD. began, previous thinking

 

B

【解析】

試題分析：考查時態(tài)及非謂語動詞。句中的動詞suggest為“表明”之意，故從句用真實語氣，根據(jù)時態(tài)用一般過去時；邏輯主語modern human behavior與think為被動關系，故用過去分詞，分詞前只能用副詞修飾。句意：在南非一個巖洞發(fā)現(xiàn)表明，現(xiàn)代人類行為的開始要比先前認為的要早的多。故B正確。

考點：考查時態(tài)及非謂語動詞

 

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