______surprises many youngsters.A、Butterflies are insectsB、Butterflies as insec

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问题 ______surprises many youngsters.

选项 A、Butterflies are insects
B、Butterflies as insects
C、Butterflies being insects
D、The fact that butterflies are insects

答案 D

解析 同位语从句。根据句子结构可知空处所缺为主语,可以是名词短语、非谓语或从句;A项是完整独立的句子,排除;B项结构符合,但是butterflies复数形式,与谓语surprises单数形式不一致,语义亦不妥,排除;C项为独立主格结构,多作状语,排除;D项为中心名词the fact后接同位语从句,结构句义皆合适。
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