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—The year 2020 is ________________ unusu...

—The year 2020 is ________________ unusual one. A new kind of virus is spreading around the world.

—The fight against the virus is like ________________ race against time.

A.a, the B.an, the C.an, a D.a, an

 

C 【解析】 考查不定冠词的用法及a/an的区别。句意:——2020年是不寻常的一年。一种新型病毒正在世界各地传播。——与病毒的斗争就像与时间赛跑。分析句子可知,第一空表示“不同寻常的一年”,在语境中为首次出现、提及这一年,且unusual以元音音素/ʌ/开头的单词,需用不定冠词an,而第二空表示“一场比赛”,同样处于首次出现、提及的语境中,且可数名词race以辅音音素/r/开头,需用不定冠词a。故选C。  
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