高二英语的问题1.Sales of CDs have greatly increased since the early1990s,when people_____to enjoy the advantages of this new technology.这道题答案是began,但答案为什么不是had begun呢?2.过去完成进行时和过去完成时怎
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![高二英语的问题1.Sales of CDs have greatly increased since the early1990s,when people_____to enjoy the advantages of this new technology.这道题答案是began,但答案为什么不是had begun呢?2.过去完成进行时和过去完成时怎](/uploads/image/z/7341190-70-0.jpg?t=%E9%AB%98%E4%BA%8C%E8%8B%B1%E8%AF%AD%E7%9A%84%E9%97%AE%E9%A2%981.Sales+of+CDs+have+greatly+increased+since+the+early1990s%2Cwhen+people_____to+enjoy+the+advantages+of+this+new+technology.%E8%BF%99%E9%81%93%E9%A2%98%E7%AD%94%E6%A1%88%E6%98%AFbegan%2C%E4%BD%86%E7%AD%94%E6%A1%88%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E6%98%AFhad+begun%E5%91%A2%3F2.%E8%BF%87%E5%8E%BB%E5%AE%8C%E6%88%90%E8%BF%9B%E8%A1%8C%E6%97%B6%E5%92%8C%E8%BF%87%E5%8E%BB%E5%AE%8C%E6%88%90%E6%97%B6%E6%80%8E)
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