He must have known the truth yesterday, _________?
A．haven’t youB．didn’t youC．have youD．did you
B

試題分析：考查反意問句：句意：他昨天一定知道真相了，是嗎？前面的簡(jiǎn)單句是用must have done表示推測(cè)，反意問句要根據(jù)時(shí)間判斷，如果有具體的過去時(shí)間，就用一般過去式，如果沒有具體的過去時(shí)間，就用現(xiàn)在完成時(shí)，排除AC項(xiàng)，因?yàn)榍懊婵隙�，所以問句是否定，選B。
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