I wonder whether the teacher is one of those who _______ to the mountain village to help the children thereA.have sentB.has sentC.has been sentD.have been sent
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D解析试题分析：考查主谓一致。one of ...“......之一”，表示的是复数概念，当先行词是one of ...时，定语从句谓语用复数；排除B、C；当先行词是the only one of...时，定语从句谓语用单数。Those和sent是动宾关系，用被动语态，故选D。考点：考查定语从句和主谓一致