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19.[1999全国]I'm going to the post office.

________ you're there, can you get me some stamps ?

A. As

B. While

C. Because

D. If

 

答案:B
提示:

题目考查时间状语从句连词while的基本意义。

(1)只要;在…时间里:

例如:It was lovely while it lasted.当它开着的时间它是很惹人喜爱的。

(2)在…同时;尽管,虽然:

例如:While the grandparents love the children, they are strict with them.“虽然祖父母们都爱他们的孩子,但却对他们要求严格”。

(3)然而;而,而且:

例如:The soles are leather, while the uppers are canvas.鞋跟是皮的,而鞋面是帆布的。

题目考查第一层意义:“在…时间里;只要”。注意当as用于“当…时候”解时,从句中应该用瞬时动词。

 


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