was known to all John had broken his promise he would stay with us for some time .A. As

问题补充：

was known to all, John had broken his promise he would stay with us for some time .

A. As; that

B. As; which

C. It; that

D. Which; that

答案：

(答案→)A. As; that

B. As; which

C. It; that

D. Which; that

解析：考查名词性从句及同位语从句。As正如，as was known to all众所周知；that引导同位语从句，解释说明名词promise，选A。