several and hundred

A.Several hundred
参考：
1. several hundred kilometers
2. Rome held sway over a huge empire for several hundred years.
3. The pilot of the crashed aircraft had logged up several hundred hours' flying time on jets.
4. She seemed somehow to have consumed four glasses of pernod to the tune of several hundred frances.
5. The public was astonished when Rolls Royce computed their debts at several hundred million pounds

选B
他们举的例子都是做定语修饰名词。在这句话中是要把several hundred 作名词用表示几百人，正常用法应该是several hundred people。不知道你们老师有没有教过你们这类定语作为名词时候的用法。比如：a seven-year-old girl（一个七岁的女孩），许多七岁的女孩就是seven-year-old girls, 而表示七岁的孩子这个群体就是seven-year-olds.所以这里应该用several hundreds

several hundred

选A. several 其实与 one two three 用法相同，既然你用two hundred, 那一定也是 several hundred. 与此同理的还有thousand,million,billion,trillion,dozen等一系列表数量的词．

several hundredS!!