10． The fear of rabies is well founded; few people are known to recover from the disease after the appearance of the clinical symptoms. （A）few people are known to recover from the disease after the appearance of the clinical symptoms. （B）few people are known to have recovered from the disease once the clinical symptoms have appeared （C）there are few known people who have recovered from the disease once the clinical symptoms have appeared （D）after the clinical symptoms appear，there are few known people who have recovered from the disease （E）recovery from the disease is known for only a few people after the clinical symptoms appear
Once, as an associated adverbial, has meanings which vary according to whether a present or past time orientation is intended. For example, I have seen him once contains once in a frequency sense("how often"), while I saw him once contains once in a time position sense(when). -- Quirk<a comprehensive grammar>
A的时态有点问题：在be known to后面要用完成时.简单说当be known 和 do sth的发生的时间一致时，用be known to do sth；而do sth发生在be known之前时，则要用be known to have done sth。逻辑上可以发现known在recover之后了,所以要用have recovered.
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发表于 2009-2-1 14:33:00
发表于 2009-2-7 17:07:00
