【题目】It is difficult for us to imagine the beauty of Jiuzhaigou, ______ we have been there in person.
A.whenB.ifC.unlessD.in case
在线课程【答案】C
【解析】
考查连词辨析。句意：我们无法想象九寨沟的美，除非我们曾经亲自去过。A. when当…时候；B. if如果；C. unless除非；D. in case万一。分析句意可知，设空处应是一个条件状语从句，故选C。
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