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A
What
B
How
C
Which
D
That
正确答案 :A
解析
本题考查句法——主语从句。
句意:人类在太空旅行时一定会担心太阳的辐射。
A项:What可引导主语从句,且在从句中做宾语。分析句子结构可知, “ ____ man must fear when traveling in space” 是一个主语从句,缺fear的宾语,用what即可。符合题意,故选A。
B项:How在主语从句中作方式状语。不符合题意,故排除。
C项:Which在主语从句中做主语或宾语等成分,且具有选择意义。不符合题意,故排除。
D项:That在主语从句中不充当任何成分,且无词义,只起连接作用。不符合题意,故排除。
故本题答案为A。
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