DNA molecule

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DNA molecule

by harsh.champ » Fri Feb 19, 2010 1:49 pm
Since the path-breaking discovery, just over fifty years ago, of the structure of the DNA molecule, scientists have made astounding progress to understand and manipulate this most important of biological molecules.

A. scientists have made astounding progress to understand and to manipulate
B. scientists have made astounding progress in understanding and manipulating
C. astounding progress has been made by scientists to understand and to manipulate
D. scientists made astounding progress in understanding and manipulating
E. astounding progress was made by scientists in understanding and manipulating
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by money9111 » Fri Feb 19, 2010 2:29 pm
Again in my opinion the answer is C because the path-breaking discovery was founded related to the progress not the scientists... and I thought "has been" was a better choice than "was"
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