选A。考查同位语从句。句意: 人们经常问同样的问题就是空气是否已经被污染了。根据句意“问题”与“是否”搭配。此处question与the air has been polluted为同位关系, 故用whether引导。【知识拓展】...
Some of the people often ask the same question the air h
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