29.I will never understand how it___ you were an hour late on such a short journey.
问题描述：
29.I will never understand how it___ you were an hour late on such a short journey.
A.came that B.became that
C.came about that D.caused that
答
it 形式主语,代替后面that从句我不理解这种情况怎会发生—如此短途你会迟来一小时?come across偶遇 come about 发生 come into 进入 come along 陪伴 .