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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