Example sentences of "[been] proven to be " in BNC.

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1 The standard method of recovery must be taught because it has been proven to be effective during testing .
2 ‘ Such a man , with a good track record can fight for his plant and his people on the very strong grounds that investment in his region has been proven to be successful .
3 Those that have seemed to indicate that ESP might be at work have generally later been discredited : either the subject of the experiment has been proven to be a charlatan or the experimental procedure itself has been shown to be flawed .
4 The allergens produced by House Dust Mites have been proven to be dangerous ‘ triggers ’ especially for Asthma attacks and allergic Rhinitis ( nasal congestion without a ‘ cold ’ ) and even in cases of Eczema .
5 Dyed Glassfish have been proven to be susceptible to Lymphocystis and the white marks may not in fact have been white spot .
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