He, along with his sister, how serious the situation is.
A. haven’t realized
B. hasn’t realized
C. don’t realize
D. didn’t realize
网友回答
A. haven’t realized
(答案→)B. hasn’t realized
C. don’t realize
D. didn’t realize
解析：考查时态。主语是He，谓语用第三人称单数，排除A,C;且根据is，又可排除D，所以选B。还没有意识到现在的情况有多糟糕。