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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
考查時態(tài)。which引導的定語從句是說明轉基因西紅柿的一般性質，故用一般現(xiàn)在時；又因為stay是連系動詞，故選C。
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