Question

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

Answer 1

D

解析:

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。