题目内容
British scientists have produced _____ they believe is the world’s smallest Christmas card.
| A.which | B.who | C.that | D.what |
D
考查宾语从句.从句中动词believe缺少宾语,故选D.英国科学家生产出了他们认为是最小的圣诞卡片.
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| A.which | B.who | C.that | D.what |