题目内容
A tourist will easily lose his way in Shanghai_____ he has a map or a guide.
| A．if | B．since | C．while | D．unless |
D
解析试题分析：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。
考点：考查连词。
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