All people, ______ they are old or young, rich or poor, have been trying their best to help those in need since the disaster.
| A．even if | B．whether |
| C．no matter | D．however |
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All people, ______ they are old or young, rich or poor, have been trying their best to help those in need since the disaster.
| A．even if | B．whether |
| C．no matter | D．however |
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