【題目】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】

試題分析：考查關(guān)系代詞的辨析。由題目可知該句是非限制性定語從句，由于前面的泰國已經(jīng)決定和中國合作建第一座標(biāo)準(zhǔn)的鐵路，這是一件事，而后面所選詞應(yīng)為可以指代這件事的詞，但由于有逗號，所以只能選which，句意為：泰國已經(jīng)決定和中國合作建第一座標(biāo)準(zhǔn)的鐵路，這也許要花122億美元。故選D。

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