The doctor suggested that the patient_____an operation without delay.

问题描述:

The doctor suggested that the patient_____an operation without delay.
A.must have B.had to have C.had D.have

选Dsuggest 有建议的意思 在表建议时都要用虚拟语气 就是(should)do should 可以省略 所以 用动词原形..