问题
选择题
You may easily lose your way in Shanghai ______ you don't have a map or a guide. [ ]
A. until
B. unless
C. though
D. if
答案
答案：D
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You may easily lose your way in Shanghai ______ you don't have a map or a guide. [ ]
A. until
B. unless
C. though
D. if
答案：D