【题目】-When did the Great Wall __________？
-In the Qin Dynasty.
A. come into being B. come into use
C. come into effect D. come into power
在线课程【答案】A
【解析】句意:——长城什么时候建成的？——在秦朝。come into being出现，
形成；come into use开始使用；come into effect实施，生效；come into power开始当权或上台。