It was that he had to ask for help．
A. so big work
B. so big a work
C. such a big work
D. such a big job[
网友回答
A. so big work
B. so big a work
C. such a big work
D. such a big job[
解析：句意：这是一个如此大的工作以至于他不得不去寻求帮助。Work为不可数名词，job为可数名词，如此大的一份工作应为：such a big job,所以应选D。