When she retired, she did a lot of______work for the Red Cross.

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问题 When she retired, she did a lot of______work for the Red Cross.

选项 A、valid
B、portable
C、prosperous
D、voluntary

答案D

解析 valid：有效的；portable：便携式的；prosperous：繁荣的；voluntary：自愿的，志愿的。根据句意可知，选D。

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