All who completed the voluntary __________ on Friday will receive a certifica...

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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”旬意才自然,因此答案为C。
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