Some of the people often ask the same question   the air has been polluted.

A. whether B. ifC. thatD. where

 

【解析】A?疾橥徽Z(yǔ)從句。句意: 人們經(jīng)常問(wèn)同樣的問(wèn)題就是空氣是否已經(jīng)被污染了。根據(jù)句意問(wèn)題是否搭配。此處questionthe air has been polluted為同位關(guān)系, 故用whether引導(dǎo)。

【知識(shí)拓展】通常用whether不用if的場(chǎng)合

引導(dǎo)主語(yǔ)從句且放在句首時(shí)。

Whether he will come is still a question.

他是否會(huì)來(lái)還是個(gè)問(wèn)題。

: 若在句首使用形式主語(yǔ)it, 而將主語(yǔ)從句放在句末, 則有時(shí)也可用if來(lái)引導(dǎo)。例如:

It was not known whether[if]he would come.

不知他是否會(huì)來(lái)。

引導(dǎo)表語(yǔ)從句時(shí)。

The question is whether we should go on with the work.

問(wèn)題是我們是否應(yīng)該繼續(xù)進(jìn)行這項(xiàng)工作。

引導(dǎo)讓步狀語(yǔ)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。

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。

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。

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(lái)得及時(shí)。

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(lái), 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。

在某些動(dòng)詞后(discuss)通常只用whether。We discussed whether we should hold a meeting.

我們討論了是否要開(kāi)一個(gè)會(huì)。

 

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