_____ is known to all, the age _______ children can go to school is seven.A．What
题型：不详难度：来源：
_____ 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 |
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答案
| C |
解析
| 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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