问题
选择题
—You ought to have made an apology to Tom yesterday evening．
—Yes, I know I __ __．
A．ought to have
B．have to
C．should
D．must have
答案
答案：A
考查情态动词。Should have done =" ought" to have done本应该做某事而实际上没有做。句意：昨天晚上你本应该向汤姆道歉的。是的，我知道我本应该向他道歉。所以选A，ought to have后省略了made an apology to him。