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

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

A.As; that

B.It; what

C.It; that

D.As; which

答案及解析： A

解析：

考查从句的用法。as作关系代词，指代后面句子的内容，第二空是由that 引导的同位语从句。