Despite that they were able to calculate faster than ever before possible, the earliest computers, built with tubes instead of transistors, were too bulky, expensive, and unreliable to be useful to businesses.
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ADespite that they were able to calculate faster than ever before possible
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BEven though it could calculate faster than previously possible
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CAlthough faster in its calculating than ever before possible
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DDespite their calculations being faster than ever before possible
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EDespite their unprecedented speed of calculation
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正确答案: E