问题
选择题
A tourist will easily lose his way in Shanghai_____ he has a map or a guide.
A．if
B．since
C．while
D．unless
答案
答案：D
题目分析：句意：除非旅游者有向导或者是地图，否则很容易在上海迷路。if如果，since自从，while在...期间，unless除非。根据句意，可知选D。
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