Without the ‘ greenhouse effect’, the earth ____ be about thirty-three degrees Celsius cooler than it is.
A.shouldB.wouldC.willD.must
B

試題分析:考查虛擬語(yǔ)氣中的情態(tài)動(dòng)詞。本題是一個(gè)虛擬語(yǔ)氣,條件是通過(guò)介詞without(要不是…如果沒(méi)有…)體現(xiàn)出來(lái)的,句意:要不是“溫室效應(yīng)”的影響,地球的溫度會(huì)比現(xiàn)在要低30華氏度。CD兩項(xiàng)不能用與虛擬語(yǔ)氣。本句的would表示會(huì);should表示應(yīng)該;故B正確。
點(diǎn)評(píng):在虛擬語(yǔ)氣中要注意四個(gè)情態(tài)動(dòng)詞should, would, might, could都是指自己本身的意思。
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