He 's really good.isn't he?( )

问题描述:

He 's really good.isn't he?( )
A:he is sure B:he isn't sure C:he sure is D :he sure isn't
为什么选c?

因为He 's really good,所以排除BD.
be sure译为[确信],A为他确信,与题意不符.故选C
(排除法)