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  3. 1.When people in developing countries worry about migration, they are usually concerned at the prospect of their best and bright

1.When people in developing countries worry about migration, they are usually concerned at the prospect of their best and bright

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问题 1.When people in developing countries worry about migration, they are usually concerned at the prospect of their best and brightest departure to Silicon Valley or to hospitals and universities in the developed world. 2. These are the kind of workers that countries like Britain, Canada and Australia try to attract by using immigration rules that privilege college graduates.
   Lots of studies have found that well-educated people from developing countries are particularly likely to emigrate. A big survey of Indian households in 2004 found that nearly 40% of emigrants had more than a high-school education, compared with around 3.3% of all Indians over the age of 25. This "brain drain" has long bothered policymakers in poor countries. 3. They fear that it hurts their economies, depriving them of much-needed skilled workers who could have taught at their universities, worked in their hospitals and come up with clever new products for their factories to make.
选项
答案他们担心这会损害本国经济，使他们失去急需的熟练劳动者，这些人本可以留在国内在大学任教、在医院工作或设计新奇产品供工厂生产。
解析 本句的主干是They fear that…，that引导宾语从句，该宾语从句的主干是it hurts their economies，现在分词短语depriving them of much-needed skilled workers作结果状语对hurts进行修饰，workers后面跟一个who引导的定语从句对其进行修饰，该定语从句中包含了三个并列的谓语成分。
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