It was said ______ was all ______ he said.

A．that that; that

B．that that; what

C．which it; that

D．that what; that

管道施工质量检查与验收是沟槽、基坑开挖与回填施工中的主要项目之一，所需要的劳动量和机械台班量很大，往往是影响施工进度、成本和工程质量的主要因素。