It is useful to science considering the earth as an object in space.A、to conside

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问题 It is useful to science considering the earth as an object in space.

选项 A、to consider
B、which considers
C、considers
D、the consideration of

答案 A

解析本题中it是形式主语，真正的主语应该是不定式或that从句。所以答案为A。

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