More and more people have realized that we won’t have cleaner water to drink unless something _______soon.
A．is doneB．was doneC．will be done D．to be done
A

試題分析：句意：越來(lái)越多的人意識(shí)到如果我們不馬上采取措施我們就不會(huì)有干凈的飲用水。在unless 引導(dǎo)的從句中，something 是主語(yǔ)，它與謂語(yǔ)動(dòng)詞do 構(gòu)成被動(dòng)的關(guān)系，所以這里要使用被動(dòng)語(yǔ)態(tài)。而且unless 從句中應(yīng)用一般現(xiàn)在時(shí)，故選A。
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