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

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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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