Question

【题目】__________ is known to everyone, the moon travels round the earth once every month.

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

Answer 1

【答案】B

【解析】考查非限制性定语从句。句意：正如人们所知的那样，月球每个月绕地球一周。这是一道由as引导的非限制性定语从句的语法题。在句中，as为关系代词，在从句中作主语，代表整个主句 the moon travels round the earth once every month.在形式上，从句与主句用逗号隔开。