16.!!! Migraine, the most debilitating common form of headache, afflicts perhaps 18 million Americans, who collectively lose 64 million workdays a year, and they cost the nation $50 billion in medical expenses and lost work time. B (A) year, and they cost the nation $50 billion in medical expenses and lost (B) year and thus cost the nation $50 billion in medical expenses and lost (C) year, so as to cost the nation $50 billion in medical expenses and lost (D) year that costs the nation $50 billion in lost medical expenses and (E) year, which thus cost the nation $50 billion in lost medical expenses and 正确答案是B，请大家给些思路和建议，谢谢
A：they无指代 C：so as to连用必错，讨论过 D：that修饰year 错 in lost medical expenses and work time改变句子意思了 E：which修饰year 错 in lost medical expenses and work time改变句子意思了
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发表于 2004-1-14 12:35:00
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