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The discovery of glass being expandable and able to be shaped by human breath revolutionized glass working to such an extent that today "glassblowing" has become the generic term for all glass working, whether the glass is blown or formed by other techniques.

(A) of glass being expandable and able to be -- Illogical meaning - the discovery of glass implies that glass was something NEW, whereas revolutionized glass working implies that glass HAD LONG AGO BEEN DISCOVERED
(B) of glass that is capable of expansion and -- Illogical meaning - same as A; usage of expansion as a noun is awkward
(C) of glass being capable of expansion and that it can be - Illogical meaning - same as A ; usage of being and expansion
(D) that glass can be expanded and it is able to be -- Parallelism issue - The discovery that glass can be expanded and it is able to be shaped are not parallel
(E) that glass can be expanded and - Correct

Answer E
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We need to first figure out what the sentence is trying to say.

You might ask: How do we know A is problematic.

Well, the passive construction of ‘being expandable’ and ‘to be shaped’ throws Option A under suspicion.

The phrase ‘the discovery of glass’ suggests that this was what revolutionised the industry. But that is not the case.

<The discovery ‘that’ glass can be expanded> captures the intent of the sentence clearly and crisply.

So we can eliminate Options A, B and C.

Between Options D and E, it's a matter of parallelism.

‘Expanded’ and ‘shaped’ are parallel in Option E. Therefore, eliminate Option D.

Option E is the best choice.

Hope this helps!
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we discover an idea but not the glass , the idea that glass is expendable. choice a, b and c are wrong
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