Example sentences of "[adv] been [verb] to [be] an " in BNC.

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1 The fact that a prominent member of the current community council and an integrated education supporter was a member of official Sinn Fein , the Workers ' party , appeared to figure in the reasoning , as this party has always been suspected to be an anti-clerical and secularist force .
2 Empirically , the assumption of constant interest rates has usually been found to be an acceptable approximation .
3 A pair of researchers arrived at the extraordinary conclusion that fusion of deuterons could be achieved without the application of massive external energy , which had previously been thought to be an indispensable condition .
4 The authorities ' earlier identification of Lembarek Boumaraaf as the assassin [ see p. 38981 ] was endorsed ; the commission confirmed that he had previously been known to be an Islamist sympathizer , but rejected as improbable the suggestion that he had acted alone .
5 Collaborative problem solving has previously been shown to be an effective stimulus to individual learning in certain circumstances , using somewhat ‘ artificial ’ tasks .
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