问题补充：
When they went into the shop and asked to look at the engagement rings, the girl brought out a cheaper one, __she had arranged with James.A.the which was whatB.what was at C.which was whatD.that was that
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C解析C。which 引导一个非限制性定语从句，其中 which 指代 a cheaper one，且在定语从句中用作主语。which was what 中的 what引导一个表语从句，它相当于 the one that。
