标题: 大家帮忙看看这道题，， [打印本页] 作者: nina23 时间: 2003-8-19 04:42 标题: 大家帮忙看看这道题，， 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 I am just wondering what is the difference between B and C.作者: 1stzhang 时间: 2003-8-19 13:40
so as to用法十分死板，只用于简单的系表结构，to后面的动作的发出者就是句子的主语。