问题
选择题
--Are you sure ____ you have seen this man?---Yes, I’m quite sure ___that.
A．that, about
B．/, to
C．of, about
D．about. of
答案
答案：A
问句中are you sure+that引导的从句,.意为:你肯定…吗? 答句中的 be not too sure about…意为: 在..方面不太有把握.