fall through 和fall down的区别

题目

fall through 和fall down的区别
他俩都有失败的意思.怎麼区分?
附题:All his plan for starting his own business fell __
A.in B.through C.down D.away

答案

fall down：跌倒；失败；倒塌
fall through：落空；失败
fall in：到期；集合；排队；倒塌；与某人在一起
fall away：vt.消失；背离,离开；疏失；抛弃；消瘦；倾斜
选B,他为开公司所想的计划全部落空