问题
选择题
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
答案：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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