The refugee crisis(难民危机) in Europe, if ________ properly, can lead to serious social problems.
A.not handled | B.not being handled |
C.not to be handled | D.not having been handled |
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The refugee crisis(难民危机) in Europe, if ________ properly, can lead to serious social problems.
A.not handled | B.not being handled |
C.not to be handled | D.not having been handled |