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5.      ,I want to go travelling in Tibet.(  )
A.Whether possibleB.Where possible
C.When possibleD.How possible

分析 有可能的时候,我想去西藏旅行.

解答 答案:C
题干是一个省略的状语从句,省略了it is;whether是否,where表示地点,when表示时间,how表示方式;句意表达的是时间,故选C.

点评 省略句通常省略的是it is或相同的主语和系动词.学习时,要注意区分和掌握.

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