is known to us, the PRC was founded on October 1, 1949.A. It B. As C. That D. What

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【题目】__________ is known to us, the PRC was founded on October 1, 1949.

A. It B. As C. That D. What

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【答案】B

【解析】

考查固定用法。句意：众所周知，中华人民共和国成立于1949年10月1日。as is known to us众所周知，该用法是固定用法，故选B。