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17.British scientists have produced ___ they believe is the world's smallest Christmas card.(  )
A.whichB.whoC.thatD.what

分析 英国科学家已经生产出他们认为是世界上最小的圣诞卡片.

解答 答案:D.
produce后面跟的是一个宾语从句,在宾语从句中they believe后面缺少一个宾语,所以用what来引导,和they believe一起构成宾语从句中的主语;故选D.

点评 本题考查宾语从句,要会分析句子的成分,并且掌握what引导主语从句表示的是一种内容,可在句中作主语、宾语或表语等.

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