______ under a microscope, a fresh snowflake has a delicate six-pointed shape.(本题2.0分)<br> A、 Seeing<br> B、 Seen<br> C、 To see<br> D、 To be seen

______ under a microscope, a fresh snowflake has a delicate six-pointed shape.(本题2.0分)
A、 Seeing
B、 Seen
C、 To see
D、 To be seen

出自：延安大学大学英语4

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