问题补充:
— You ought to have called her yesterday . — Yes , I know I .
A. ought to
B. ought go have
C. ought have done
D. ought to have called
答案:
A. ought to
(答案→)B. ought go have
C. ought have done
D. ought to have called
解析:简单对话中只重复助动词、系动词和情态动词。如既有情态动词又有系动词或助动词,则两者都重复,不重复行为动词。