请教高中英语问题，求达人解答！
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_____ was known to all that he had broken his promise ______ he would give...
C it形式主语；that引导同位语从句
16. B What引导主语从句；that引导表语从句
17. D whichever：引导宾语从句；whoever=anyone who引导宾语从句
18. A what=the state that引导宾语从句
19. C whoever=anyone who引导宾语从句
C it形式主语；that引导同位语从句
16. B What引导主语从句；that引导表语从句
17. D whichever：引导宾语从句；whoever=anyone who引导宾语从句
18. A what=the state that引导宾语从句
19. C whoever=anyone who引导宾语从句
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