Some of the people often ask the same question the air has been polluted.
A. whether B. ifC. thatD. where
【解析】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】通常用whether不用if的场合
①引导主语从句且放在句首时。
Whether he will come is still a question.
他是否会来还是个问题。
注: 若在句首使用形式主语it, 而将主语从句放在句末, 则有时也可用if来引导。例如:
It was not known whether[if]he would come.
不知他是否会来。
②引导表语从句时。
The question is whether we should go on with the work.
问题是我们是否应该继续进行这项工作。
③引导让步状语从句时。
Whether he agrees or not, I shall do that.
不管他同意与否, 我都要那样做。
④与or连用分别引导两个从句时。例如:
I don’t know whether he is wrong or she is wrong.
我不知道是他错了, 还是她错了。
⑤用于不定式之前时。例如:
I’m not sure whether to stay or leave.
我不知是留还是去。
⑥用于介词之后时。
It depends on whether the letter arrives in time.
这取决于信是否来得及时。
⑦直接与or not连用时。例如:
I will write to you whether or not I can come.
我能不能来, 我将写信告诉你。
若不是直接与or not用在一起, 则有时也可用if。
I don’t know whether[if]he will win or not.
我不知他是否能赢。
⑧在某些动词后(如discuss等)通常只用whether。We discussed whether we should hold a meeting.
我们讨论了是否要开一个会。
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