I am worried about Jim because he __(suffer) from the stress

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I am worried about Jim because he __(suffer) from the stress of exams these days.
正确答案为has suffered,为什么不用is suffering?以前做过一道题目是I am preparing for the exam for these days.这句话同样也是these days用的进行时,为何上面一道题目不用?

用完成时表动作发生的先后顺序,因为我是在得知她遭受考试压力后才感到担心,suffe先于worry,所以用has suffered.
另外,I am preparing for the exam for these days.是表示现阶段一直在进行的动作.[还有个问题,此句中的for可能有点问题,我们可以直接讲I am preparing for the exam these days.]

I am worried about Jim because he __(suffer) from the stress I am worried about the s____ of the children because they ha I am worried about the s____ of the treatment i am worried about the ___of the childern(safe) i am worried about you 为什么是 worried 不是 worrying I was not a bit worried about the final exam because I alway I can not have worried about the I hope you understand?i am The stress I am talking about is largely trying to get used 新世纪的题目语法的1 I am worried about the ____ (safe) of the childr 英语语法高手进挑出下列句中表语 Way is he worried about Jim?The old men was I am still worried about the job interview.A.stay away B.che I am worried about the person you are的中文意思