题目

This cake is very sweet. You _____ a lot of sugar in it. A. should put       B. could have put       C. might put      D. must have put 答案：D 解析: D由前面的提示“蛋糕很甜”可知是“你一定是在里面放了很多糖”，故选D。must have done表示对过去情况的肯定的推测，“过去一定做某事。”

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