It was ________ that he had to ask for help.A.such big a work B.a so big job C.a so big work D.

问题描述:

It was ________ that he had to ask for help.A.such big a work B.a so big job C.a so big work D.
为什么B不行

so+adj./adv.+n.(名词可数不可数都可以)
such+a/an+adj.+n.(必须是可数名词)
这是固定用法 你记住就行了
adj.(形容词) adv.(副词)