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    精英家教网 > 高中英语 > 题目详情
    Scientists have created GM tomatoes which ______ fresh for 45 days, three times as long as normal tomatoes.
    A．are stayedB．have been stayedC．stayD．stayed
    C
    考查时态。which引导的定语从句是说明转基因西红柿的一般性质，故用一般现在时；又因为stay是连系动词，故选C。
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