_______at in this way, the air pollution in this region doesn’t seem so serious.

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问题 _______at in this way, the air pollution in this region doesn’t seem so serious.

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

答案 B

解析分词用法。本题分句的主语是the air pollution，与动词look应该构成逻辑上的被动关系，因此应选过去分词。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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A.lookingB.focusonC.variousD.extensiveE.regionF.differences