题目内容：

It was （ ）that he could not finish it by himself.
A、such difficult work
B、so difficult a work
C、such a difficult work
D、so difficult work

优质解答

A such +adj+a/an+可数单
such +adj＋复数或不可数名词
so＋adj＋或 a/an+可数单
但 many much前只能用 so