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

試題分析：考查時(shí)態(tài)及非謂語動(dòng)詞。句中的動(dòng)詞suggest為“表明”之意，故從句用真實(shí)語氣，根據(jù)時(shí)態(tài)用一般過去時(shí)；邏輯主語modern human behavior與think為被動(dòng)關(guān)系，故用過去分詞，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)代人類行為的開始要比先前認(rèn)為的要早的多。故B正確。
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