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
D

試題分析：考查情態(tài)動(dòng)詞。must have done 肯定做了某事，表示對(duì)過(guò)去的肯定推測(cè)。句意：蛋糕非常甜，你肯定在里面放了很多糖。所以選D。could have done 本可以做而沒做
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