was known to all William had broken his promise he would give us a rise.A. As;whichB. As;

问题补充：

was known to all,William had broken his promise he would give us a rise.

A. As;which

B. As;that

C. It;that

D. It;which

答案：

A. As;which

(答案→)B. As;that

C. It;that

D. It;which

解析：从句意分析，promise后是同位语从句，因此首先排除A、D两项;如果用it作形式主语，all之后不能用逗号，故选B项。