It was terribly windy last night and there was ___18-degree drop in ___temperature.A.a;/ B./;/ C.an;/ D.an;the第二空为什么?

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It was terribly windy last night and there was ___18-degree drop in ___temperature.
A.a;/ B./;/ C.an;/ D.an;the
第二空为什么?

名词在使用到的时候都是有所指的,the temperature就是指明了是“当时的温度”