有道题目 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.
答案说是B year and thus cost the nation $50 billion in medical expenses and lost.
我查了一下，thus是副词，是“因此、这样”的意思。
我查了一下，你说的thus后面接-ing 是不是这样的形式：
Old people often try to economize on heating, thus endangering their health
在这里，thus不是连接的作用，只是修饰。如果删除thus，意思也对。就是-ing做结果状语, 表示前面部分的导致结果
但是也可以写成old people often try to economize on heating and thus their health are endangered.
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发表于 2013-12-5 15:23:53
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