Example sentences of "this [vb past] [prep] [det] [adj] [noun] " in BNC.

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1 During the 1970s , knowledge of stratospheric chemistry improved considerably and this led to some radical rethinking of the effect of oxides of nitrogen on the ozone layer , as illustrated by the World Health Organization statements concerning the potential effect of aircraft emissions .
2 At the same time a fairly substantial Luftwaffe attack was launched against Malta by the units briefly based in Sicily , and this led to some severe fighting over the island on 6 May .
3 I wondered if this happened to many other smokers .
4 This began with some flattering words about us both , and implied that he had for long been unable to make up his mind about the abdication .
5 The results indicated that this progressed in several broad stages .
6 This militated against any substantial devolution of managerial power and initiatives to the divisions .
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