题文
When a disaster occurs, all people, ________ they are old or young, rich or poor, try their best to help those in need.
| A．no matter | B．whether | C．however | D．even though |
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When a disaster occurs, all people, ________ they are old or young, rich or poor, try their best to help those in need.
| A．no matter | B．whether | C．however | D．even though |
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