_____ is known to all, the age _______ children can go to school is seven.
A．What; whichB．It; whenC．As; at whichD．Which; when
C
考查引導(dǎo)詞。As作為引導(dǎo)詞一般用于句首意思為：如同。the age為下文邏輯時間狀語，當(dāng)前面有介詞時，指物的引導(dǎo)詞只能使用which，故選C。
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