请例题说明carry on go on 区别 另外还有一道题目

请例题说明carry on go on 区别 另外还有一道题目
1,Some of the students have already learned enough English to ____ a conversation with a native Englis .A.hold on B.keep on C.go on D.carry on
问：BCD都有继续的意思 在这题中 区别在哪里?2,the president stepped onto the platform,__the journalists questions
A prepared answering B preparing answer C preparing to answer D preparing for answering .问：CD应该都可以选择啊?

1 选C 句意：有的学生以学到的英语已经足够和母语为英语的人进行交流了.
go on 此处是进行意思.go on apicnic 进行野餐
keep on 是一直做••••••.carry on 是中途中断过,后来又接着做.
如：Don't keep on singing that song ,please.拜托不要一直唱那首歌.
She wants to carry on her studies.她相继续她的学业.
2 选D 因为prepare to do 没有此用法.prepare for sth/doing sth
再问： prepare to do 有的 高中课本上有 刚才查字典了也有
再答： 你好 只有be prepared to do 的用法，意思是：能够并愿意做。 如：I am prepared to lend my car to you .我愿意把车借给你。