________you see something suspicious, report to the police immediately.A、Unless

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问题 ________you see something suspicious, report to the police immediately.

选项 A、Unless
B、If
C、Although
D、Before

答案 B

解析本题考查状语从句的用法。If意为“如果，假如”，用于引导条件状语从句。分析句意可知，“看到可疑的东西”与“向警方报告”构成条件关系，If在此句中引导真实性条件从句，因此确定本题答案为B)。

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