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13．We often have a holiday on National Day．（　　）

A．

seven days

B．

seven-days

C．

seven-day

D．

seven day's

分析國慶節我們通常有七天假期．

解答答案：C．
根據We often have a holiday on National Day，可知本句考查了復合形容詞的用法，這里用復合形容詞修飾名詞holiday．連字符號連接數詞、名詞和形容詞，用作形容詞，這時的名詞不用復數形式．結合選項可知應選C．故選C．

點評本題考查指導學生了解two-month用做形容詞時，加短線用單數，并且后面必須有名詞．

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