Example sentences of "[noun sg] has [been] a constant [noun sg] " in BNC.
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| 1 | As the former Director of WHO Global Programme on AIDS has said : ‘ Denial at personal , social , national and international level has been a constant problem and remains today a grave threat to public health . ’ |
| 2 | Ever since , your father has been a constant visitor to Drennan 's house . |
| 3 | The advertising of the scheme and the consequent level of public awareness has been a constant source of concern . |
| 4 | To preserve Wood Walton as a wetland has been a constant challenge for the Nature Conservancy Council , which leased Wood Walton Fen from the RSNC in 1954 . |
| 5 | The size of the Strathclyde region has been a constant source of argument . |