标题: one quick question, let us discuss [打印本页] 作者: tonydong 时间: 2005-6-9 09:10 标题: one quick question, let us discuss 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. (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 the answer is B, but should B use "Costs" instead of "cost"? , since the subject is single 作者: 薰衣紫草 时间: 2005-6-9 09:19