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

A.whileB.becauseC.unlessD.when

【答案】C

【解析】

考查條件狀語從句。句意：政府呼吁我們避免訪問擁擠的地區(qū)和醫(yī)療機構，除非有必要。A. while然而，當……時候；B. because因為；C. unless除非；D. when當……時候。由語境可知，it is necessary表條件，所以用unless引導條件狀語從句。故選C項。

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