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

分析 有可能的時(shí)候，我想去西藏旅行．

解答 答案：C
題干是一個(gè)省略的狀語(yǔ)從句，省略了it is；whether是否，where表示地點(diǎn)，when表示時(shí)間，how表示方式；句意表達(dá)的是時(shí)間，故選C．

點(diǎn)評(píng) 省略句通常省略的是it is或相同的主語(yǔ)和系動(dòng)詞．學(xué)習(xí)時(shí)，要注意區(qū)分和掌握．

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