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

分析 英國(guó)科學(xué)家已經(jīng)生產(chǎn)出他們認(rèn)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(gè)賓語(yǔ)從句，在賓語(yǔ)從句中they believe后面缺少一個(gè)賓語(yǔ)，所以用what來(lái)引導(dǎo)，和they believe一起構(gòu)成賓語(yǔ)從句中的主語(yǔ)；故選D．

點(diǎn)評(píng) 本題考查賓語(yǔ)從句，要會(huì)分析句子的成分，并且掌握what引導(dǎo)主語(yǔ)從句表示的是一種內(nèi)容，可在句中作主語(yǔ)、賓語(yǔ)或表語(yǔ)等．

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