57.from space, our earth, with water covering 70% of its surface, appears to be a ublue planetn.

A. Seen

B. Seeing

C. To be seen

D. Having seen

正确答案：A

解析：

57.【翻译】我们地球表面的70%被水覆盖着，从太空看就像一个“蓝色的行星”、【精析】A本题考查过去分词的用法。逻辑主语our earth与see之间为动宾关系，且句中没有明显的表丕时间先后顺序的词,所以应用过去分词短语作条件状语，表示被动意义。故选A。

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