The strike _____so much violence and trouble finally ended after an agreement was reached
A.causing
B.having caused
答案:A 为什么
I was thinking hard over the problem of getting enough money for my new term______a nice idea occured to me.
A.as B.when 答案:B , A为什么不可以呢
this is the most important assignment facing American journalism--to _______to the reader the problem of the day ,and to make international news as understandable as community news。
A。make it clear B。make clear 答案:B 为什么
谢谢,2,3已经懂了,可是第一句having caused不也是分词吗?为什么不可以用。那个已经引起很多暴力和麻烦的罢工最终结束了。