This is one of the happiest days ____ spent in my life.

A have ever been                 B that has never been

C which was ever                 D we have

面对人大代表的依法______，有些部门的负责人虽然还不能圆满答复，但都表现出虚心接受，认真反思的态度。
填入划横线部分最恰当的一项是( )。

A．质疑
B．质问
C．质对
D．质询