Some of the people often ask the same question the air has been polluted. A.wh
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Some of the people often ask the same question the air has been polluted. A.whether | B.if | C.that | D.where |
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答案
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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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