About fifty million Americans are active in______is called fitness walking.

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问题 About fifty million Americans are active in______is called fitness walking.

选项 A、that
B、which
C、what
D、something

答案C

解析题干：大约五千万美国人积极参与被称为是健身步行的活动。考查名词性从句引导词。根据句子结构的分析，本题缺乏in的宾语，只有what能放在介词之后充当宾语从句的连接词。故答案为C。

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