planters found their expenses （rising;raising）and their inco

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planters found their expenses （rising;raising）and their income from
the sale of cotto（reduced;reducing）怎么填?求讲解 more and more slaves(were needed;need) to work on the new and large plantations,and higher and higher prices were demanded (for;with;to)them怎么填,求讲解

第一个填reduced, 语法我不是很会,但是如果用reducing,前面要加一个be动词
第二个是were need, 因为想表达的更多的奴隶被需要,而不是奴隶自发的需求
第三个最好是by, 但是要硬选还是选for
再问：第一个没明白；第三个也没有明白
再答：第一个，可以说 the sale of Cotto is reducing, 或者 the sale of Cotto reduced，但是不能说The sale of Cotto reducing

第三个没有对的。
再问：第一个为什么可以那么写？第三个可不可以填In呢？
再答： The sale of Cotto is reducing, 是标准的主语+be动词+ 动词进行时的格式，而The sale of cotto reduced,是现在对已经发生的结果的一种总结，这两种都是可以的，而The sale of Cotto reduceing, 从语法角度，缺少一个实意动词。

第三个不可以，首先没有demand in 这个词组，其次，这句话想表达的意思是越来越高的加个被他们所要求，而with, for 和to，都表达不出这个被的意思

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