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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. |
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发表于 2003-8-19 04:42:00
