Not until actually ________ with water shortage ________ appreciate the value of water to a region.
A.facing; one canB.faced; can oneC.faced; one cannotD.facing; cannot one
B

試題分析:考查狀語(yǔ)從句的省略式和倒裝句:not until后面直接用非謂語(yǔ)動(dòng)詞做狀語(yǔ),說(shuō)明是省略了從句的主語(yǔ)和be動(dòng)詞,而be faced with是“面對(duì)”所以是過(guò)去分詞,AD是錯(cuò)的,not until引導(dǎo)的時(shí)間狀語(yǔ)從句放在句首,主句用部分倒裝,而且是肯定式。句意:直到確實(shí)缺水,一個(gè)人才能真正欣賞水對(duì)一個(gè)地區(qū)的價(jià)值。選B。
點(diǎn)評(píng):如果主句的主語(yǔ)和從句的主語(yǔ)一致,且狀語(yǔ)從句的謂語(yǔ)動(dòng)詞中有 be 動(dòng)詞,從句的主語(yǔ)連同be 可一起省略,該類狀語(yǔ)從句多為時(shí)間、地點(diǎn)、條件、方式或讓步等,連詞為when, while, though, if, unless, although, as if 等,后面通常接分詞、不定式、形容詞、名詞等。以否定詞開(kāi)頭的句子要求部分倒裝。注意下列句子中助動(dòng)詞或情態(tài)動(dòng)詞提前、甚至補(bǔ)充助動(dòng)詞的用法:例:Not until yesterday did little John change his mind.(小約翰直到昨天才改變了主意。)
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