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was known to them all that Bob had broken his promise he would give them a rise.

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was known to them all that Bob had broken his promise he would give them a rise.

____ was known to them all that Bob had broken his promise ____ he would give them a rise.

  A. As; which   B. What; that     C. It; that    D. It; which

试题答案

C

解析:

此处It为形式主语,第一个that引导主语从句,第二个that引导同位语从句。