I am not sure___________A.when he was off to London B.that he had been married for year

问题描述:

I am not sure___________A.when he was off to London B.that he had been married for year

A
我不确定他什么时候离开去伦敦.
B错的原因是与主句不符.not sure 后不是可以加that 么?B 的意思是:他结婚数年了。( 与主句‘ 我不确定’ 矛盾呀)