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    【题目】Thailand has decided to begin building its first standard-gauge railways in cooperation with China, ______may cost $12.2 billion.

    A. when B. that C. it D. which

    【答案】D

    【解析】

    试题分析：考查关系代词的辨析。由题目可知该句是非限制性定语从句，由于前面的泰国已经决定和中国合作建第一座标准的铁路，这是一件事，而后面所选词应为可以指代这件事的词，但由于有逗号，所以只能选which，句意为：泰国已经决定和中国合作建第一座标准的铁路，这也许要花122亿美元。故选D。

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