Question

Not until actually ________ with water shortage ________ appreciate the value of water to a region.

A．facing; one can

B．faced; can one

C．faced; one cannot

D．facing; cannot one

Answer 1

B

試題分析：考查狀語從句的省略式和倒裝句：not until后面直接用非謂語動(dòng)詞做狀語，說明是省略了從句的主語和be動(dòng)詞，而be faced with是“面對(duì)”所以是過去分詞，AD是錯(cuò)的，not until引導(dǎo)的時(shí)間狀語從句放在句首，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)：如果主句的主語和從句的主語一致，且狀語從句的謂語動(dòng)詞中有 be 動(dòng)詞，從句的主語連同be 可一起省略，該類狀語從句多為時(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。）