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题库 / Prep2007E2-SC-107
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.
Galileo did not invent the telescope, but on hearing, in 1609, that such an optical instrument had been made, he
Galileo had not invented the telescope, but when he heard, in 1609, of such an optical instrument having been made,
Galileo, even though he had not invented the telescope, on hearing, in 1609, that such an optical instrument had been made, he
Even though Galileo did not invent the telescope, on hearing, in 1609, that such an optical instrument had been made,
Even though Galileo did not invent the telescope, but when he heard, in 1609, of such an optical instrument being made, he
B里面的错误不是逗号后面缺主语，but作为并列连词前后主语相同时后面省掉主语是可以的；B的错误在于heard of a instrument，显然听到的应该是一件事而非听到一件器械。
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