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5．-Shall I tell your best friends what happened to you yesterday？
-_____ they ask you（　�。�
A．Not unlessB．Not ifC．Not exceptD．No though

分析 --我要告訴你最好的朋友你昨天發(fā)生了什么事嗎？--不，除非他們問你．

解答 答案是A．本題考查省略句．根據句意完整的回答是"Don't tell them unless they ask you．"，省去去上文相同的部分，只保留了not和unless they ask you，故選A．

點評 本題考查省略，省略常常是為了避免重復的省略，所以要在補全被省略的部分的情況下整體理解語境，再做判斷．

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