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(shí)態(tài)及非謂語(yǔ)動(dòng)詞。句中的動(dòng)詞suggest為“表明”之意，故從句用真實(shí)語(yǔ)氣，根據(jù)時(shí)態(tài)用一般過(guò)去時(shí)；邏輯主語(yǔ)modern human behavior與think為被動(dòng)關(guān)系，故用過(guò)去分詞，分詞前只能用副詞修飾。句意：在南非一個(gè)巖洞發(fā)現(xiàn)表明，現(xiàn)代人類(lèi)行為的開(kāi)始要比先前認(rèn)為的要早的多。故B正確。

考點(diǎn)：考查時(shí)態(tài)及非謂語(yǔ)動(dòng)詞

 

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