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这道语法题:In Martin Luther King's time,the money spe

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这道语法题:In Martin Luther King's time,the money spe
nt on educating a black child was just one forth _____ on each white child.
A.that spent
B.what to be spent
C.it had been
D.which was spent
为什么不选D'选C'请详细地解释谢谢''
这道题应该选A'上面写错了'不是选C
这道语法题:In Martin Luther King's time,the money spe
答案是A that是指示代词 不是关系代词 代替前面 的不可数 名词money
后面 是过去分词 作定语
如果 选D的话 前面仍需要 that 即 just one forth that which was spent
否则 one forth指代不明
再问: 为什么不能用被动?
再答: 过去分词 作定语 与所修饰的词 就是 被动关系 相当于 一个定语从句
the money spent on educating a black child was just one forth that spent on each white child.
=the money which was spent on educating a black child was just one forth that which was spent
on each white child.
再问: 不能用was是因为一句句子当中不能出现两个be动词吗?
再答: 可以 用 which was spent 这与 主句的谓语 无关
作定语的spent=which was spent
再问: 就是不知道为什么不加was搞不懂啊'
再答: 加was 可以 但在定从中作主语的 关系代词 which 不能省略 In Martin Luther King's time, the money which was spent on educating a black child was just one forth that which was spent on each white child.