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 the birds


by the time they had reached adulthood, 98 percent of men and 75 percent of women born in the country have been attacked by the birds

by the time they reach adulthood, 98 percent of men and 75 percent of women, who were born in the country, had been attacked by the birds

by the time they reached adulthood, 98 percent of men and 75 percent of women born in the country had been attacked by the birds

98 percent of men and 75 percent of women that were born in the country were attacked by the birds by the time they reach adulthood

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 the birds

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题目分析：

在时态上我们要注意，主句用一般现在时并不意味着宾语从句也要用现在时，相反地，主句用一般过去时也不意味着宾语从句也要用一般过去时；宾语从句的时态往往会独立于主句时态。


选项分析：

A选项：前面是had reached adulthood，后面是have been attacked by，而事实上前者发生在后者的后面，时态混乱，而且人类在reach adulthood之后不会再有成长阶段，所以不应该用had reached adulthood，而应该用一般过去时；再者，由于be attack发生在reach adulthood前面，所以有明显的时间对比，应该be attack用过去完成时had been attacked。

B选项：reach的时态有误，同时使得had been attacked没有时间对比来说明be attack是发生在过去的过去。

C选项：Correct. 本选项在语法和逻辑上均是正确的。

D选项：were attacked和reach时态错误同选项(A)。

E选项：adulthood身后少了逗号，插入语必须头尾用两个逗号将其隔开，例如：
James, a famous movie star, is friendly.
例句中，a famous movie star就是插入语，被两个逗号隔开。

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Prep2008E2-SC
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