---i'm sure Tom will pass the final examination

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---i'm sure Tom will pass the final examination
---i think so .he___for it for months
A.had been preparing
B.was preparing
C.is preparing
D.has been preparing
答案为什么是D呢?

翻译：--我确信汤姆将会通过期末考试.--我有同感.他为它（这次期末考试）准备了好几个月了.
此题考查各种时态的特征和区别.
1.A为过去完成进行时,表示某一动作/状态从过去开始,一直延续到另外一个过去的时刻为止.
B为过去进行时,表示过去某个时刻正在进行的动作.
C为现在进行时,表示现在正在进行的动作.
D为现在完成进行时,表示某一动作从过去开始,一直延续到现在,可能刚刚结束,也可能还在继续,甚至有可能会继续延续下去.
2.从上下文句意来看,“汤姆为考试做准备”的动作从几个月前开始,而且现在还在继续,所以用现在完成进行时最佳.

---i'm sure Tom will pass the final examination Tom will pass the test.I'm sure (合并成一句话) ____ ____ ____ ____ I am trying bard to ()(pass) the final examination The student,if well_____,will pass the examination without m Work harder ,or you will fail to pass the final examination( I’m sure Andrew will win the first prize in the final.-- I t He didn’t pass the final examination.He ______ it. He didn't pass the final examination.He _______ it. i am cramming for the final examination Ron will pass his exam ,I'm sure . I think you will ______ (sure) pass the exam. I wish you pass the examination