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:考查狀語從句的省略式和倒裝句:not until后面直接用非謂語動詞做狀語,說明是省略了從句的主語和be動詞,而be faced with是“面對”所以是過去分詞,AD是錯的,not until引導(dǎo)的時間狀語從句放在句首,主句用部分倒裝,而且是肯定式。句意:直到確實缺水,一個人才能真正欣賞水對一個地區(qū)的價值。選B。
點評:如果主句的主語和從句的主語一致,且狀語從句的謂語動詞中有 be 動詞,從句的主語連同be 可一起省略,該類狀語從句多為時間、地點、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詞或情態(tài)動詞提前、甚至補充助動詞的用法: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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