I didn’t know at first, but later we became good friends.A. who is the boyB. who the boy i

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A. who is the boy
B. who the boy is
C. who was the boy
(答案→)D. who the boy was
解析：本题考查的特殊疑问句作为宾语从句，句意：我已开始不知道这个男孩是谁，但是后来我们成为了好朋友。结合语境可知从句描述的是过去的状态，故用一般过去式。宾语从句一般为陈述语序。故选D。