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

分析 英國科學家已經(jīng)生產(chǎn)出他們認為是世界上最小的圣誕卡片．

解答 答案：D．
produce后面跟的是一個賓語從句，在賓語從句中they believe后面缺少一個賓語，所以用what來引導(dǎo)，和they believe一起構(gòu)成賓語從句中的主語；故選D．

點評 本題考查賓語從句，要會分析句子的成分，并且掌握what引導(dǎo)主語從句表示的是一種內(nèi)容，可在句中作主語、賓語或表語等．

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