The weekend program of special activities for handicapped children was a great s

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问题 The weekend program of special activities for handicapped children was a great success thanks to those who generously______their time.

选项 A、voluntary
B、volunteer
C、voluntarily
D、volunteered

答案 D

解析 who generously______their time是定语从句，修饰those，横线处应填入以their time为宾语的动词。本句时态为过去时，故选(D)volunteered.volunteer one’s time表示“自愿花时做某事”。

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