问题
选择题
．______was known to them all that William had broken his promise______ he would give each of them a gift.
A．As, which
B．What, that
C．It , that
D．It , which
答案
答案：C
第一个空为it作形式主语，指代后文的that从句；第二个空为同位语从句，应由that引导。.