问题
选择题
The style of Western art has changed many times ______ Chinese art has changed less often.
A．while
B．before
C．since
D．however
答案
答案：A
考查连词。while 然而，表示对比，before 在什么之前，since自从，however 副词，然而，句意：西方艺术的风格已经改变了许多次然而中国的艺术通常改变的很少。所以选A。