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？前面的簡單句是用must have done表示推測，反意問句要根據(jù)時間判斷，如果有具體的過去時間，就用一般過去式，如果沒有具體的過去時間，就用現(xiàn)在完成時，排除AC項，因為前面肯定，所以問句是否定，選B。
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