Example sentences of "[verb] been worked [prep] [adj] " in BNC.
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| 1 | An extensive 40cm thick bed of syn-diagenetic origin has been worked in Cambrian pelites around the Harlech Dome ( Bennett , 1987 ) . |
| 2 | Whether they had been worked at some preceding date is a matter of no little conjecture but is unlikely and it seems that the miners from Keswick started there in 1599 . |
| 3 | Under DuĊĦan the Serbs had encouraged German miners ( known as Saxons ) from Transylvania to develop the mines of Kosovo , some of which had been worked in Roman times . |
| 4 | The main occupation of the village throughout the centuries was obviously agriculture , but three quarries have been worked since Roman times , and the oolitic limestone is found in many local churches , including Beverley minster . |
| 5 | Tin placers have been worked in many areas in South-west England . |