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【题目】It is nearly 50 years ______ the People's Republic of China was founded.
A.after
B.before
C.when
D.since

【答案】D
【解析】句意:中华人民共和国建立已有50年了。A. after在……之后;B. before在……之前;C. when当……的时候;D. since自从。句型:It is/has+时间段 since+一般过去时的句子“……已经有多长时间了”。故选D。

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