—How long is the bridge? —It's . A. 300-...

—How long is the bridge?

—It's .

A. 300-meter-long B. 300-meters long

C. 300 meters long D. 300 meter long

C 【解析】试题分析：句意：—这座桥有多长？—300米长。固定句式：主语+系动词+数词+名词+形容词。300米meter变复数meters，排除D，A. 300-meter-long 用于修饰后面的名词，B. 300-meters long结构不对，故选C。考点：考查复合形容词的用法。

考点分析：

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