问题
选择题
— You ought to have called her yesterday .
— Yes , I know I ____ .
A．ought to
B．ought to have
C．ought have done
D．ought to have called
答案
B。
简单对话中，只重复助动、系动词和情态动词，如既有情态动词，又有助动词或系动词，则两者都重复，不重复行为动词。
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