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4.In Sydney,there's only ________ average of 23days a year when ________ sun doesn't shine.(  )
A.the,theB.an,/C.an,theD.the,/

分析 在悉尼,一年平均有23天的时间没有阳光.

解答 答案:C
固定短语an average of 意为:平均…,因此第一个空填an;由于sun表示世界上独一无二的事物,因此要在它的前面加定冠词the;故选C.

点评 本题考查冠词的用法;做本题时,首先应掌握固定短语an average of 的意义及用法;其次要知道:在表示世界上独一无二的事物的前面加定冠词the的用法;最后除了要牢固掌握含有冠词或零冠词的固定短语外,还要注意总结定冠词,不定冠词以及零冠词的其他用法.

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