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

B whether...or...

C 无论

B

B
无论是老人还是孩子
whether...or