___ under a microscope, a fresh snowflake has a delicate six-pointed shape.
___ under a microscope, a fresh snowflake has a delicate six-pointed shape.
A、Seeing
B、Seen
C、To see
D、To be seen
【正确答案】：B
【题目解析】：主语为 fresh snowflake，因此see 与主语为被动关系，要使用过去分词形式 seen
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