did or could

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belly_ttt

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From the time of their introduction, however, the problem of opening the cans ______ not detract from their wide acceptance as a solution to the problem of food preservation
a) could
b) did

What do you choose and how come?
 
Joined
Feb 18, 2008
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Personally, I would choose 'did' for your example. 'Could' seems to me a little doubtful, whereas 'did' is a lot more definite and as such fits the context.
 
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