British scientists have produced _____ they believe is the world’s smallest Christmas card．
A．whichB．whoC．thatD．what
D
考查賓語從句.從句中動(dòng)詞believe缺少賓語,故選D.英國科學(xué)家生產(chǎn)出了他們認(rèn)為是最小的圣誕卡片.
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