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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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