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-- The traffic is busy in Harbin.
--It’s really so. When the subway      , the traffic will become better.
A finishes         B will finish        C is finished

C

解析试题分析:句意:哈尔滨的交通很繁忙。——真的是这样。当地铁完工时,交通会变得更好一点。当主句描述将来的动作时,从句中用一般现在时态表示将来的动作,从句主语是被完成的对象,故用被动语态。结合语境可知选C。
考点:时态及语态
点评:而英语状语从句的时态与主句有比较紧密的联系,若主句为一般将来时,时间和条件状语从句通常要用一般现在时表示将来,而不能直接使用将来时态。语态的判断主要是确定句子主语与谓语动词的关系。如果是主动关系则用主动语态,反之如果是动宾关系,则用被动语态,尤其要注意一些特殊动词的用法。

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