______ for your help, We’d never have been able to get over the difficulties.

A．Had it not

B．Had it not been

C．If it were not

D．If we had not been

“人类日益生活在质量大堤之下”是（）的著名比喻。

A.质量法中

B.朱兰

C.戴明

D.桑德霍姆