Question

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

Answer 1

D

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。