1.at one's own expense 固定搭配：自费
2.自从看到,强调对现在造成的影响.用现在完成时.
3.在过去发生的事用过去时,而且这件事情没有延续到现在并且不强调对现在造成的影响,所以不用现在完成时,何况答案里也没有,这就没有难度了.
1 Now an increasing number of middle school students go abro
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