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    精英家教网 > 高中英语 > 题目详情
    (2013·安徽，21)From space, the earth looks blue.This is ________about seventy­one percent of its surface is covered by water.
    A．whyB．howC．becauseD．whether
    A
    考查名词性从句。此处考查表语从句。根据句意：地球看起来是蓝色的。这是因为其表面71%是被水覆盖的。
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