If there were only one case, that could be an accident or , but there are three cases within the last ten months.A. coincidence B. opportunity C. mistake D. misfortune A [解析]句意:如果只有一种情况.那可能是意外或巧合.但在题目和参考答案——青夏教育精英家教网—

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If there were only one case, that could be an accident or , but there are three cases within the last ten months.

A. coincidence B. opportunity C. mistake D. misfortune

A 【解析】句意：如果只有一种情况，那可能是意外或巧合，但在过去的十个月里有三起病例了。coincidence巧合；opportunity机会；mistake错误；misfortune不幸，灾祸。根据句意可知这里应选A。

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