1.I have failed four times,but my teacher encourages me to h

AB都不沾边,D这个是固定用法,这里的第五次是个不特指的第五,不强调顺序.C是强调顺序的第五.
百度里有人问了跟你同样的问题,它那个句子还复杂些.给你转过来
问：a second time与the second time有什么区别
Mary ased me to repeat_____telephone number_____second time so that she could write it down.
A.the;the B.the;a C.a;the Da;a
B
这里没有the和a的特例!
那么普通方法做呀telephone number为什么the,特指,哪里看出来啦?
因为Mary要记这个号码,哪个号码she could write it down.的号码,而不是泛指的随便一个号码
那么a second time与the second time岂不是很搞?
好像我这里泛指特指都可以的嘛,其实两个强调点不一样了,a second time强调【再一次,once again】,不强调次序,顺序
Mary要我再重复一下这个电话号码以便她能记下来
the second time是“第二次”,强调顺序
这里的强调点在于telephone number上,那么后面就适当弱化了,我要的是你重复这个号码,所以这里a比the好
比如He was made to clean the room a second time,其中
clean the room 才是强调点,a second time不是,但我说It is the second time that he was made to clean the room,我用强调句强调“第二次”也不是不可以
you can try a second time强调的 是try,你可以再试试
you can try the second time,强调第二次,你可以第二次试一下