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taking over turning over getting over coming over
is; died is; has been dead had been; was dead was; has died
that it is to be that it has been to have been
has gone to has been to has been in has been for
proves that the epidemic has been spreading very fast over the past eight years implies that the USAID was not very successful in the past eight years shows that the epidemic has spread too fast to be controlled over the past eight years explains that the epidemic has been controlled
was reduced has been reduced were reduced have been reduced
was reduced has been reduced were reduced have been reduced
gone to been to come to been in
reduced by been reduced by reducing to been reduced to
would have been would be will be will have been
have been used has been used are used is using
is； was had been； is was； has been has been； is
that it is to be that it has been to have been
that it is to be that it has been to have been
that it is to be that it has been to have been
is, died is, has been dead has been, was dead was, has died
that it is to be that it has been to have been
that is to be that it has been to have been
that is to be that it has been to have been
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