______man must fear when traveling in space is radiation from the sun.

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问题 ______man must fear when traveling in space is radiation from the sun.

选项 A、Which
B、How
C、What
D、That

答案C

解析 分析句子结构,句子谓语动词为is,radiation from the sun作is的表语,则is前面部分作主语,故本句为主语从句,what在主语从句(what man mustlear)中作fear的宾语。所以答案为C。
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