fall through 和fall down的区别

问题描述:

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

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