I hope all the precautions against air pollution, ______ are suggested by the lo

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问题 I hope all the precautions against air pollution, ______ are suggested by the local government, will be seriously considered here.

选项 A、as
B、while
C、after
D、since

答案 A

解析 as在句中是关系代词，引导非限定性定语从句，其先行词是precautions，其他几个选项都不是关系代词，所以是错误的。

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