A survey by the National Council of Churches showed that in 1986 there were 20,736 female ministers, almost 9 percent of the nation's clergy, a number double that of 1977's.
双重所有格,杀掉
我错误的理解了 that of 1977‘s 为 the number of 1977's female miniters , 因为根据1977’s 前文并没有明确说明1977年的什么。 所以这里的错误是在于 that 和 ‘s 的重复
that of 和‘s重复
选了E是觉得前面都读完后没有特别合适的,但没有注意到E的严重缺陷:that of 与 's 重复。
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