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The government calls on us to avoid visi...

The government calls on us to avoid visiting crowded areas and medical institutions _______ it is necessary.

A.while B.because C.unless D.when

 

C 【解析】 考查条件状语从句。句意:政府呼吁我们避免访问拥挤的地区和医疗机构,除非有必要。A. while然而,当……时候;B. because因为;C. unless除非;D. when当……时候。由语境可知,it is necessary表条件,所以用unless引导条件状语从句。故选C项。  
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