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
前文说“蛋糕很甜”，下文的语境显然应该是“你一定是在里面放了很多糖”，故用“must+完成式”表示对过去情况的肯定推测。
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