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 --你希望非洲的這種疾病多久能被控制。
--盡快.

解答 答案:C.
根據(jù)before引導(dǎo)的時間狀語從句本句the African can keep the disease under control用的是一般現(xiàn)在時,可知本句考查句型It will be some time before;意為"要過多久才",前面的主句用一般將來時.其中do you expect可以看作是插入語,所以how long引導(dǎo)的特殊疑問句用的是陳述語序.
keep…under control"將…控制住";故選C.

點(diǎn)評 注意before引導(dǎo)的其它句型:
(1)It was+一段時間+before 過了多久就…It wasn't two years before he left the country.還沒到兩年他們離開了那國家.
(2)it was not+時間段+before …"意為"不久就…","沒過(多長時間)就…".
(3)表示"…還沒來得及…就…".目的在于強(qiáng)調(diào)從句動作發(fā)生之前,主句動作已發(fā)生.
He rushed out of the room before I could say a word.
(4)表示"在…之前就…".這時主句與before從句中的兩個動作按時間先后依次發(fā)生.
It was evening before we reached the little town of Winchester.
(5)表示"趁…","等到…",或"沒等…就…"等.
He made a mistake,but then he corrected the situation before it got worse.

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