Example sentences of "of [noun sg] [vb base] been [art] [noun] " in BNC.

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1 The major limitations of therapy have been the presence of large stones ( >15–20 mm ) , large and tortuous ducts , non-dilated ducts in which the basket can not expand , and a stricture distal to the stone(s) .
2 Unemployment , housing , education , and the future of mining have been the issues .
3 In addition , both these areas of law have been the subjects of close scrutiny by the courts over the last few years .
4 The Willses ' most obvious contributions in the sphere of education have been the founding and development of the University of Bristol .
5 The best businesses over a long period of time have been the ones with a single thrust .
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