They regard__________as their duty to provide the best service for their customers. A) this B) whatThey regard__________as their duty to provide the best service for their customers.A) thisB) what C) it D) that选it是为什么?求高人通俗易懂讲解
问题描述：
They regard__________as their duty to provide the best service for their customers. A) this B) what
They regard__________as their duty to provide the best service for their customers.
A) this
B) what
C) it
D) that
选it是为什么?求高人通俗易懂讲解
答