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
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(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。