问题补充：
—Tom,did you see the film “Jaws” last night?
—Yes,but I really,because I had lots of work to do.
A. couldn’t have
B. mustn’t have
C. needn’t have
D. oughtn’t to have
答案：
A. couldn’t have
B. mustn’t have
C. needn’t have
(答案→)D. oughtn’t to have
解析：考查虚拟语气，“本不应该怎么样”。
