2. 外语
  3. ______ from space, our earth, with water covering 70% of its surface, appears as a "blue planet ".

______ from space, our earth, with water covering 70% of its surface, appears as a "blue planet ".

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问题 ______ from space, our earth, with water covering 70% of its surface, appears as a "blue planet ".
选项 A、Seen
B、Seeing
C、To be seen
D、Having seen
答案A
解析 本题测试非谓语动词的用法。本句的主语为earth，从外部空间看地球，从地球角度来说只能是被别人看，所以只能使用被动式。本题只有A和C是被动式，A为过去分词，表示完成和被动的含义，C是不定式，不定式表示将来或者目的，所以只有A为正确选项。句子的意思是：“地球表面百分之七十是水，从太空上看像个蓝色的行星。”
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