Example sentences of "[unc] [noun] have been [v-ing] at " in BNC.

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1 Crash investigator , David Bristow used tyre marks on the road and a reconstruction to calculate that Gooch 's car had been travelling at up to 96 mph .
2 Converted to luminosity , this means that the sun 's brightness has been dimming at a rate of 0.05 per cent per year , a figure that is in good agreement with the satellite results .
3 Britain 's hedgerows have been vanishing at the rate of 1,800 miles a year .
4 Along with the rest of the property sector , British Land 's shares have been trading at a considerable discount to its assets per share , and yesterday 's move is an attempt to close the 40 per cent gap which built up as institutions took a dimmer view of the market .
5 In the 1980s , aggregate Gross Domestic Product ( GDP ) has been roughly static , and per capita GDP has been falling at a time when net aid flows have been rising .
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