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11.-How long do you expect it _______ before the African can keep the disease under control?
-As soon as possible.(  )
A.isB.has beenC.will beD.will have been

分析 --你希望非洲的这种疾病多久能被控制住?
--尽快.

解答 答案:C.
根据before引导的时间状语从句本句the African can keep the disease under control用的是一般现在时,可知本句考查句型It will be some time before;意为"要过多久才",前面的主句用一般将来时.其中do you expect可以看作是插入语,所以how long引导的特殊疑问句用的是陈述语序.
keep…under control"将…控制住";故选C.

点评 注意before引导的其它句型:
(1)It was+一段时间+before 过了多久就…It wasn't two years before he left the country.还没到两年他们离开了那国家.
(2)it was not+时间段+before …"意为"不久就…","没过(多长时间)就…".
(3)表示"…还没来得及…就…".目的在于强调从句动作发生之前,主句动作已发生.
He rushed out of the room before I could say a word.
(4)表示"在…之前就…".这时主句与before从句中的两个动作按时间先后依次发生.
It was evening before we reached the little town of Winchester.
(5)表示"趁…","等到…",或"没等…就…"等.
He made a mistake,but then he corrected the situation before it got worse.

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