Scientists have created GM tomatoes which ______ fresh for 45 days, three times
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Scientists have created GM tomatoes which ______ fresh for 45 days, three times as long as normal tomatoes.A.are stayed | B.have been stayed | C.stay | D.stayed |
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答案
C |
解析
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。 |
举一反三
All visitors to this village______ with kindness.A.treat | B.are treated | C.are treating | D.had been treated |
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