_____man must fear when traveling in space

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_____man must fear when traveling in space
is radiation from the sun and Van Allen Belts
A,What B,which C,how D,that 这个题选什么呀?
这是什么句式呀!
向回答问题的大师们说一声谢谢了!
这句话的意思是什么呀!
空格的位置没有错的！
正确的答案是A
谁给我分析一下呀
我真的不知道听谁的了

若空格位置没错,应该是：
What man must fear when traveling in space is radiation from the sun and Van Allen Belts .
what 引导主语从句,意思是,the thing that...
句子意思是：人类太空旅行时一定会担心的东西是太阳辐射及范艾伦辐射.

_____man must fear when traveling in space 一.1.-----man must fear when travelling in space is radiation 一道英语题高手来13.Before traveling in space, you must know what it Before traveling in space, you must know what it might feel Before traveling in space,you must know what it might feel l A space station is a place for people traveling in space to 英语翻译Millons of stars are traveling about in space.A few form More and more man-made satellites are traveling in space now astronauts must exercise for ( ) every day in space so they They __an earthquake when they were traveling in Sichuan pro Astronauts must ____(space suit)in space .用所给单词的正确形式填空 The possibility _____man's traveling to the moon has been pr