问题补充:
I didn’t know at first, but later we became good friends.
A. who is the boy
B. who the boy is
C. who was the boy
D. who the boy was
答案:
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。