问题
选择题
British scientists have produced _____ they believe is the world’s smallest Christmas card．
A．which
B．who
C．that
D．what
答案
答案：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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