A warm thought suddenly came to me I might use the pocket money to buy some flowers for my mother's birthday。
A. if
B. when
C. that
D. which
网友回答
A. if
B. when
(答案→)C. that
D. which
解析： 主要测试同位语从句。句子意思：我突然有了一个很好的想法：我可以用我的零花钱买些花作为母亲的生日礼物。与以上翻译可知名词thought的内容就应该是句子I might use the pocket money to buy some flowers for my mother's birthday的内涵，另外结合语境可知句子中不缺少任何成分，只是少了应道同位语从句的引导词。所以答案应该是C。