Mr.Wang didn’t know ________________ yesterday evening.
问题描述：
Mr.Wang didn’t know ________________ yesterday evening.
A.when does his son come here B.when his son comes here
C.when did his sin come here D.when his son came here选C吗?
答
选D.
know后面接的从句是做know的宾语,宾语从句的结构：疑问词+陈述句.
1.A和C都是特殊疑问句,不能做know的宾语从句.
2.只能在B和D中选,由于主句的谓语didn't是过去时,而从句B中的comes是一般现在时,因而时态不一致.
3.所以D.