______life could be found on Mars was once believed by scientists.

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问题 ______life could be found on Mars was once believed by scientists.

选项 A、What
B、As
C、That
D、While

答案C

解析 句意:科学家曾认为火星上能找到生命。名词性从句题。分析句子结 构可知,本句为主语从句,且从句中不缺少成分,所以应用that来引导,that在从句中 不担当任何成分,本身也没有词义,但不能省略。故选C。
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本试题收录于: 英语题库普高专升本分类
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