Accidents are of frequent ____ on this motorway because the traffic is extremely heavy here. ( 章节：6 难度：3)
- A、arrival
- B、proportion
- C、scale
- D、occurrence
正确答案:D
答案解析:有
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Accidents are of frequent ____ on this motorway because the traffic is extremely heavy here. ( 章节：6 难度：3)
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