___many times,but he made the same mistakes again.A.Having been warned B.Although I had warned himC.Having warned him D.I had warned him这题选D,说是but为并列连词,因此前一部分既非状语从句也非谓语动词形式.所以排除其他项A B C 选项哪个是状语从句 哪个是非谓语动词形式啊?
问题描述：
___many times,but he made the same mistakes again.
A.Having been warned B.Although I had warned him
C.Having warned him D.I had warned him
这题选D,说是but为并列连词,因此前一部分既非状语从句也非谓语动词形式.所以排除其他项
A B C 选项哪个是状语从句 哪个是非谓语动词形式啊?
答
A C 都不行 ，用分词置于句首，主句和从句主语应该一致，而本题不是的，although和but 不能同时出现在同一句中
答
AC都是非谓语
B是状语从句
答
d
having （been） done 就是非谓语动词形式
答
因为后面有转折连接词but，所以前面就应该是完整的句子，只能选D(B中的although与but不能同时出现）
having （been） done 就是非谓语动词形式
答
应选D
A中,应把but去掉
B中,although不能和but连用
C中,应用被动语态
A\C为非谓语动词形式,B为状语从句