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I will never understand how it ______ that you failed in the examination for you are such a good student.
A．came aboutB．brought inC．stayed upD．ended up
A

試題分析：考查詞組：A. came about發(fā)生B. brought in引進(jìn)，賺錢C. stayed up熬夜D. ended up結(jié)束，句型：How did it come about that…，怎么會…,句意：我永遠(yuǎn)不能理解我是怎么考試不及格的，因為我是好學(xué)生。選A。
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