Question

选择题It was_that he had to ask for help.A.so big work B.such big work C.a so big work

选择题It was_that he had to ask for help.A.so big work B.such big work C.a so big work D.so big a work答案选B.为什么不选A呢

Answer 1

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)

Answer 2

such a/an+形容词+可数名词单数
so+形容词+不可数名词/可数名词复数