标题: ZDF138 [打印本页] 作者: cz 时间: 2003-10-22 21:39 标题: ZDF138 [face=Verdana]#138) Once common throughout the Western plains, black-footed ferrets are thought to have declined in number as a result of the poisoning of prairie dogs, their prey.
C) the decline in the number of black-footed ferrets is thought of E) the numbers of the black-footed ferret are thought to have declined
选项C, E 错在哪里? ( E ) 是不是因为 the numbers of 的 numbers 应该用 the number of ? [/face]作者: Marrow 时间: 2003-10-22 21:49
c,e的主语能符合once throughout..么？