我 觉得,首先, per milligram 是个插入语,所以应该省略.
Galileo did not invent the telescope, but on hearing, in 1609, that such an optical instrument had been made, he quickly built his own device from an organ pipe and spectacle lenses.
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, in1609, 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, 1609, of such an optical instrument being made, he
这题选a.
所以选a 的话,因为比较错误, three times as 错. 排除
我觉得应该选c,因为 per milligram 作插入语省略了, that 就可以直接连在price 后面了, 至于d 和e ,我不知道为什么错,但是总感觉不如c来的好.请各位NN帮忙看看d,e的毛病!!