By the time Paola Conti became head designer for Fiori Fashions, she______ more than 15 collections for the company’s line of sp

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问题 By the time Paola Conti became head designer for Fiori Fashions, she______ more than 15 collections for the company’s line of sportswear.

选项 A、had developed
B、will develop
C、has developed
D、develops

答案A

解析 by the time引导的时间状语从句中使用了动词过去式形式became,且根据上下文语义,从句表达的是过去发生的事情,且主句所表达的内容发生在从句之前,故主句应采用表示在过去某特定时间点之前发生的事情的过去完成时。因此过去完成时形式(A)had developed为正确答案。(B)为将来时形式,(C)为现在完成时形式,(D)为一般现在时形式,时态上都不正确。By the time(到……的时候)应作为状语从句引导词进行记忆。
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