【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(yǔ)從句。句意：政府呼吁我們避免訪問(wèn)擁擠的地區(qū)和醫(yī)療機(jī)構(gòu)，除非有必要。A. while然而，當(dāng)……時(shí)候；B. because因?yàn)椋?/span>C. unless除非；D. when當(dāng)……時(shí)候。由語(yǔ)境可知，it is necessary表?xiàng)l件，所以用unless引導(dǎo)條件狀語(yǔ)從句。故選C項(xiàng)。

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