Great changes have taken place in China since the People’s Republic of China     
in 1949．
A．was foundB．foundedC．was foundedD．found
C
考查動詞時態(tài)及語態(tài)。found成立；根據(jù)文中的時間狀語in 1949可知應用用一般過去式，句意：自從在1949年中華人民共和國成立以來中國發(fā)生了巨大變化。根據(jù)語境中華人民共和國是被建立的，所以應用被動語態(tài)，故選C。
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