It remains doubtful ______ immediate measures could be taken to prevent underground water pollution.
A.howB.whetherC.thatD.where
B

試題分析:考查主語(yǔ)從句。本句中的it是形式主語(yǔ),真正的主語(yǔ)是后面的whether immediate measures could be taken to prevent underground water pollution.因?yàn)橹骶涞闹^語(yǔ)部分是remains doubtful仍然很懷疑,說(shuō)明是不確定的事情,故使用whether。句意:是否會(huì)有立刻的措施被采取來(lái)阻止地下水污染仍然值得懷疑。That引導(dǎo)的主語(yǔ)從句表示的是確定的事情,AD項(xiàng)的句意不相符。故B正確。
點(diǎn)評(píng):在復(fù)合句中做主語(yǔ)的從句叫做主語(yǔ)從句,它的位置與陳述句基本結(jié)構(gòu)中的主語(yǔ)相同。引導(dǎo)主語(yǔ)從句的關(guān)聯(lián)詞有:連詞:that, whether;連接代詞:who, whom, whose, what, which;連接副詞:when, where, why, how;復(fù)合詞:whatever, whoever, whomever, when?螄ever, wherever, whichever, however.解答這類(lèi)題目,關(guān)鍵在于分析清楚句子結(jié)構(gòu)。通過(guò)判斷引導(dǎo)詞在從句中所作的成分及意義,來(lái)選擇正確的引導(dǎo)詞。
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