This cake is very sweet. You _________ a lot of sugar in it.  
A．should putB．could have putC．might putD．must have put
D
前文說“蛋糕很甜”，下文的語境顯然應該是“你一定是在里面放了很多糖”，故用“must+完成式”表示對過去情況的肯定推測。
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