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:

情态动词十have done，可表示过去没有实现的可能性，意为"本来可以(可能)……"。 "我本来应该请他吗？"是由should+have done构成的虚拟条件。