问题
选择题
I wonder whether the teacher is one of those who _______ to the mountain village to help the children there.
A．have sent
B．has sent
C．has been sent
D．have been sent
答案
答案：D
题目分析：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。