The style of Western art has changed many times Chinese art has changed less often.
A. while
B. before
C. since
D. however
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(答案→)A. while
B. before
C. since
D. however
解析：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。