_____ at through the microscope, the structure of these plant cells are quite cl

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问题 _____ at through the microscope, the structure of these plant cells are quite clear.

选项 A、Looking
B、Looked
C、Having looked
D、To look

答案 B

解析考查分词用法。本题分句的主语是the structure of these plant cells，与动词look应该构成逻辑上的被动关系，因此look应选过去分词。B符合题意；A和C都表主动，D用在句中语意不通。

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