75.,the next , problem was how to make a good plan.
答案解析
解析：
分析句子结构并结合选项可知,逗号后面是一个完整的句子,逗号前后两部分之间没有连词,所以空
处应为独立主格结构。独立主格结构是一个名词或代词(作为逻辑主语)加上一个不定式、分词、介词短语、 形容词或副词等,在句中作状语,所以 B项符合题意。A项为现在分词的完成式,其逻辑主语应为“人”,与句子的主语 the next problem 不一致;C 项为倒装结构,不符合语法规则;D 项是一个完整的句子,但没有连词,且时态与后面句子的时态不一致,所以这三项均可排除。
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