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[Sentence Correction]
试题详情
题目：
Galileo did not invent the telescope, but on hearing, in 1609, that such an optical instrument had been made, he uickly built his own device from an organ pipe and spectacle lenses.
选项:
A、Galileo did not invent the telescope, but on hearing, in 1609, that such an optical instrument had been made, he
B、Galileo had not invented the telescope, but when he heard, in 1609, of such an optical instrument having been made,
C、Galileo, even though he had not invented the telescope, on hearing, in 1609, that such an optical instrument had been made, he
D、Even though Galileo did not invent the telescope, on hearing, in 1609, that such an optical instrument had been made,
E、Even though Galileo did not invent the telescope, but when he heard, in 1609, of such an optical instrument being made, he
答案:
A
提问：
我有两个问题：
1. 在基础课上，老师说 A 选项 “but” 前 是一句话，“but” 后 又是一句话，所以两个主语分别对应 两个句子，所以不是双主句。但是整句中间并没有句号，都是逗号。请问我们如何在满是逗号的句子中，判断 此句 共有几句话 从而判断双主语是否存在呢？又如何判断 每句话 什么时候结束呢？
2. 能不能麻烦您解释一下 A 选项的句式结构 和句意呢？我没太理解这句话的意思，因为逗号太多了。谢谢！
解答：
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