______ under a microscope, a fresh snowflake has a delicate six-pointed shape.A、

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问题 ______ under a microscope, a fresh snowflake has a delicate six-pointed shape.

选项 A、Seeing
B、Seen
C、To see
D、To be seen

答案 B

解析本句考查非谓语动词的用法。分词短语作状语，因为主语和分词之间的关系是动宾关系，因此用过去分词。

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