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

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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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