Out of a random sample of drivers, 21%______(在前一年中出过交通事故).had been in traffic ac

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问题 Out of a random sample of drivers, 21%______(在前一年中出过交通事故).

选项

答案 had been in traffic accidents in the previous year

解析 ①本题首先要求译出过去完成时。②另外，还考查时间状语及短语traffic accidents的正确表达。

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