题目内容
15.Since the middle of the last year,the bike-sharing market _____in Beijing.A. | boomed | B. | was booming | C. | will boom | D. | has boomed |
分析 从去年中旬开始,北京的自行车共享市场繁荣起来了.
解答 答案:D句中since连接的时间状语,表示从过去到现在的时间,是现在完成时态的用法.故选D.
点评 现在完成时表示过去发生的动作对现在造成的影响或结果或表示过去的动作或状态持续到现在.用法有:过去发生的某一动作对现在造成的影响或结果或到现在为止已经发生或完成的动作;表示过去发生的并且持续到现在的动作或状态.
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