问题
选择题
______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
答案：B
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。
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