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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。
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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