语法求助

weiran · 发表于 2010-4-24 16:10:46

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
为什么选B不选A呢，为什么呢，B我觉得once 后面已经用了现在完成时了，前面的句子应该用过去完成时啊，求解。

weiran · 发表于 2010-4-24 17:34:30

给个回复啊，各位大牛呢

语法求助

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