Example sentences of "problem may have [vb pp] a " in BNC.

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1 The general growth of awareness of environmental problems may have provided a problem-centred focus which helps to overcome any sense of theoretical looseness .
2 But it gives no indication that the pricing problems may have had a long history .
3 This week 's extension of the suspension has lead to a further letter to unit trust holders.But it gives no indication that the pricing problems may have had a long history .
4 Changes in these practices were stimulated , in many if not all cases , by the need to respond to population pressure ; once again , the same problem may have invoked a different response in different cultural milieux .
5 The ozone pollution problem may have had a long association with southern California but it has now become a very serious problem in the Texas Gulf coast , the north-east corridor , and other heavily populated regions ( figure 8.11 ) .
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