All who completed the voluntary________on Friday will receive a certificate recognizing their participation.

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问题 All who completed the voluntary________on Friday will receive a certificate recognizing their participation.

选项 A、train
B、trained
C、training
D、trainable

答案C

解析 空格为被形容词voluntary修饰的名词的位置,因此A和C为正确答案的备选项。句子要求表示“志愿培训”句意才自然,因此答案为C。
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