【題目】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：中華人民共和國(guó)建立已有50年了。A. after在……之后；B. before在……之前；C. when當(dāng)……的時(shí)候；D. since自從。句型：It is/has+時(shí)間段 since+一般過(guò)去時(shí)的句子“……已經(jīng)有多長(zhǎng)時(shí)間了”。故選D。

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