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。

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。