旧PREP sc2 107 being问题

107.
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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, 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,  答案：A

(E) Even though Galileo did not invent the telescope, but when he heard, in 1609, of such an optical instrument being made, he

语法注释上说Being made现在分词表示动作正在进行，与句子原意不符。请问这里的动作正在进行是指现在进行还是指与主句谓语同时进行。如果是前者是不是所有being done都表示现在进行，那么was being done又怎么解释。如果是后者，我也不认为这违反句意。原句意完全可以认为是伽利略听到望远镜正在建造于是他就建造了自己的装置啊。

请NN赐教！

"原句意完全可以认为是伽利略听到望远镜正在建造于是他就建造了自己的装置啊。"

你现在不可以“完全可以认为……”作为前提了，

原句已经告诉你他听说这事的时候，望远镜had been made了

即使，即使语法有错，这也是句子原意了。