問題詳情：
單項填空；請從A、B、C、D四個選項中選出可以填入空白處的最佳選項。
We had _______ 8-day holiday during this National holiday, but some of us felt unhappy because of _________ heavy traffic on the highways.
A. an, the B. a, the C. a, a D. an, a
【回答】
A
知識點：冠詞
題型：選擇題
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