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

游客2024-09-06 39

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。

转载请注明原文地址:https://tihaiku.com/zcyy/3745887.html

相关试题推荐

随机试题

最新回复(0)

Inanurbansocietyinwhichhighlystructured,fast-pacedandstressfulworklo