is known to all is that the earth is smaller than the sun.A. As B. WhatC. It D. Which

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【题目】_________ is known to all is that the earth is smaller than the sun.

A. As B. What

C. It D. Which

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【答案】B

【解析】

考查名词性从句。句意：众所周知，地球比太阳还小。复合句的主语是一个名词性从句，从句没有引导词和主语，表示“所……的（事）”，故用what引导，其双重作用，故选B。