Some of the people often ask the same question the air has been polluted.
A. whether B. ifC. thatD. where
【解析】選A。考查同位語從句。句意: 人們經(jīng)常問同樣的問題就是空氣是否已經(jīng)被污染了。根據(jù)句意“問題”與“是否”搭配。此處question與the air has been polluted為同位關(guān)系, 故用whether引導(dǎo)。
【知識拓展】通常用whether不用if的場合
①引導(dǎo)主語從句且放在句首時(shí)。
Whether he will come is still a question.
他是否會(huì)來還是個(gè)問題。
注: 若在句首使用形式主語it, 而將主語從句放在句末, 則有時(shí)也可用if來引導(dǎo)。例如:
It was not known whether[if]he would come.
不知他是否會(huì)來。
②引導(dǎo)表語從句時(shí)。
The question is whether we should go on with the work.
問題是我們是否應(yīng)該繼續(xù)進(jìn)行這項(xiàng)工作。
③引導(dǎo)讓步狀語從句時(shí)。
Whether he agrees or not, I shall do that.
不管他同意與否, 我都要那樣做。
④與or連用分別引導(dǎo)兩個(gè)從句時(shí)。例如:
I don’t know whether he is wrong or she is wrong.
我不知道是他錯(cuò)了, 還是她錯(cuò)了。
⑤用于不定式之前時(shí)。例如:
I’m not sure whether to stay or leave.
我不知是留還是去。
⑥用于介詞之后時(shí)。
It depends on whether the letter arrives in time.
這取決于信是否來得及時(shí)。
⑦直接與or not連用時(shí)。例如:
I will write to you whether or not I can come.
我能不能來, 我將寫信告訴你。
若不是直接與or not用在一起, 則有時(shí)也可用if。
I don’t know whether[if]he will win or not.
我不知他是否能贏。
⑧在某些動(dòng)詞后(如discuss等)通常只用whether。We discussed whether we should hold a meeting.
我們討論了是否要開一個(gè)會(huì)。
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