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——How do you find the cake?
——This cake is very sweet. You ______ a lot of sugar in it.
A．should putB．could have putC．might putD．must have put
D

試題分析：考查情態(tài)動詞用法。情態(tài)動詞+動詞原形表示在現在情況的推測；情態(tài)動詞+have done表示對過去情況的推測。本題蛋糕很甜，說明放了很多的糖是在過去發(fā)生的事情，排除AC。Must have done一定做了某事。Could have done可能做了某事，句意你認為蛋糕怎么樣？—非常甜。你一定放了很多的糖。故Ｄ正確。
點評：must表示有把握的肯定推測。如果是對過去的推測，使用情態(tài)動詞+have done的形式。
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