It is 50 years ___the People's * was founded.
问题描述：
It is 50 years ___the People's * was founded.
A.after
B.before
C.when
D.since
答
D
It is/has+时间段 since+一般过去时的句子.意为：.已经有.(多长时间了）
本题：*建立已有50年了