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

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

选项 A、while
B、since
C、that
D、as

答案 D

解析考查引导非限定性定语从句的关系代词。as可作为关系代词引导非限定性定语从句，且as引导的从句可放在句首、句中和句末。that可以作关系代词引导定语从句，但是不能引导非限定性定语从句；while和 since不能引导定语从句。

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