Sentence Correction
试题详情
题目：
The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox, which caused only a mild illness, they are immune from smallpox.
选项:
A、which caused only a mild illness, they are immune from
B、causing only a mild illness, they become immune from
C、which causes only a mild illness, they are immune to
D、causing only a mild illness, they became immune from
E、which caused only a mild illness, they would become immune to
答案:
E
提问：
Causing 和which 这里为什么选从句，which不是只能就近指代这个cowpox吗，但是doing形式可以知道前面那件事，这里不是说的是因为接触牛痘才能导致生小的疾病吗，是因为这个事导致的这个结果；后面半句的事态选择，过去时为什么没有would形式好，是虚拟吗？
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提问：
想请Tina老师回答一下，就是causing这个词可以指代EJ 这个人，可以指代实验对象，也可以指代人们被感染了牛痘这件事，所以我认为causing也不算错呀，因为明显前两个指代对象不能causing，只能是人们感染这件事causing。虽然我也能理解which
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提问：
请Tina老师回答，which caused和causing不都应该是就近修饰吗？在og精讲中您说causing的主语可能为前句从句的主语，那which就没有这种问题吗？谢谢老师。
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