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  3. ( )under a microscope, a fresh snowflake has a delicate six-pointed shape.

( )under a microscope, a fresh snowflake has a delicate six-pointed shape.

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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
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