情态动词和虚拟语气
1、---I wonder why Mr Green hasn’t showed up at the meeting yet.
---I’m not sure, but he _______ in a traffic jam driving here.
A. could be stuck B. might stuck
C. might have been stuck D. must have stuck
选C。表示对过去已经发生事情的推测应该用情态动词的完成时形式，但might的可能性不大；结合上下文的意思可以知道应该用被动形式。
2、— Why didn’t you come to Mike’s birthday party yesterday?
— Well, I ____, but I forgot it.
A. should B. must C. should have D. must have
选C。should have的后面省略了come。should have come表示“本应该而实际上没有”。
3. Jane’s pale face suggested that she ill, and her parents suggested that she medical examination.
A. be; should have B. was; have
C. should be; have D. was; has
选B。当动词suggest作“建议”解时，后面的宾语从句用“(should) + 动词原形”；作“暗示；表明”解时用陈述语气。