求解一道PREP语法题！！！！！！

aglair萱 · 发表于 2011-5-7 17:37:31

The first detailed study of magpie attacks in Australia indicates that by the time they had reached adulthood, 98 percent of men and 75 percent of women born in the country have been attacked by birds.
A bu the time they had reached adulthood, 98 percent of men and 75 percent of women born in the country have been attacked by birds
B by the time they reached adulthood, 98 percent of men and 75 percent of women, who were born in the country, had been attacked by birds
C by the time they reached adulthood, 98 percent of men and 75 percent of women born in the country had been attacked by birds
D 98 percent of men and 75 percent of women that were born in the country by the time they reached adulthood were attacked by birds
E 98 percent of men and 75 percent of women who were born in the country, by the time they reached adulthood had been attacked by birds

总觉得这里面的they 有点指代不清，不知道应该指代什么！求高人解答！！！！！！

求解一道PREP语法题！！！！！！

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