求教高手几个有关状语从句的问题1.when和while在定义上有什么区别?希望可以举例说明.2.Though_____m
求教高手几个有关状语从句的问题
1.when和while在定义上有什么区别?希望可以举例说明.
2.Though_____many times,David often drives after drinking.
A.to be warned B.having been warning C.warned D.being warned
这一题答案应该选什么?(我这里写的B,但似乎答案是C,为什么不能用完成时呢?)
3.The novel was completed in 1978,_____the economic system has seen great changes.
A.when B.during which C.since then D.since when
这里选D,为啥不能选C呢,这里when难道是代词?
对不起,第二题B选项应为having been warned,