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This cake is very sweet. You _____ a lot of sugar in it.
A．should putB．could have putC．might putD．must have put
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”，故選D。must have done表示對過去情況的肯定的推測，“過去一定做某事�！�
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