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 |
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