问题
选择题
Since the opening and reform policy, China a boom in its economy.
A．enjoys
B．has been enjoying
C．enjoyed
D．having enjoyed
答案
答案：B
考查时态。句意：自从改革开放政策以来，中国一直经济繁荣。用现在完成进行时态表示的是从过去到现在还要持续下去。根据题意中国的经济还要繁荣下去。故选B。