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

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

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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、after
D、as
答案D
解析 as作关系代词，引导定语从句，as指代整个主句，本句中as作从句的主语。例如：He did it on purpose，as is often the case．这是他故意干的，情况通常是这样。The sunrise，as is seen from the top of Mount Tai，is a brilliant spectacle ．从泰山顶上看日出是一片辉煌壮观的景色。而while，since和after都是连词，只能引导状语从句，不在从句中作成分，更不用说作主语了。
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