问题
选择题
I ______________ have passed my examination easily，but I made too many stupid mistakes．
A．must
B．will
C．shall
D．could
答案
D
题目分析：考查情态动词与虚拟语气。句意：我能很容易通过考试，但我犯了许多愚蠢的错误。根据下句话提到 but I made too many stupid mistakes 可知是对过去的虚拟，用could have done ，故选D项。
考点 : 考查情态动词与虚拟语气