Example sentences of "[prep] [noun sg] [vb base] been the [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 .
6 It would not , they say , have abolished competition : his ‘ Grand Lodges ’ , each directing its own industry , would in effect have been the head offices of huge joint stock companies owning the entire means of production and subject to no control by the community ; and they would have been able to revert to the capitalist form of enterprise , admitting fresh generations of workers only as employees and not as shareholders ‘ thus creating at one stroke a new capitalist class and a new proletariat ’ .
7 More recently , investments in South Africa , in tobacco and drug companies and in firms using animals for experimentation have been the subject of protest and workers have tried to influence their pension fund managers away from these .
8 The main barriers to growth have been the complexity of using the systems , their inability to handle anything but the simplest graphics , the high cost of connect-time charging and poor publishing decisions about which databases to offer online .
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