____ is known to everybody, the moon travels round the earth.A．AsB．ItC．WhenD．Whe
题型：不详难度：来源：
| ____ is known to everybody, the moon travels round the earth. |
答案
| A |
解析
试题分析：考察定语从句。本句中的as是非限制性定语从句的引导词。As指代后面一句话的内容在句中作主语。CD两项不能再句中作主语，只能做状语。It不能引导定语从句。句意：众所周知的是 是月球绕着地球转。本句解题的关键是句中的逗号。故A正确。
点评：本题考察了关系代词as的用法，as可以指代一句话的内容在非限制性定语从句中做主语或者宾语，放在句首，which也可以指代一句话的内容，但是不能放在句首。 |
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