Though having lived abroad for years, many Chinese still the traditional customs.
A. observe
B. possess
C. perform
D. support
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(答案→)A. observe
B. possess
C. perform
D. support
解析：考查动词：A. observe观察，遵守，庆祝B. possess拥有C. perform表现D. support支持，句意：虽然在国外生活多年，很多中国人仍然遵守中国的传统风俗。选A。