is known to all, the age children can go to school is seven.A．What; whichB．It; whenC．As; at whichD．Which; when 题目和参考答案——青夏教育精英家教网—

题目内容

_____ is known to all, the age _______ children can go to school is seven.

A．What; which

B．It; when

C．As; at which

D．Which; when

考查引导词。As作为引导词一般用于句首意思为：如同。the age为下文逻辑时间状语，当前面有介词时，指物的引导词只能使用which，故选C。

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