自从进入电子时代以来,发生了翻天覆地的变化.在全世界电脑被广泛使用
A since便是自从……以后 的意思时,句子结构为 现在（将来）完成时+动词过去式（一般式）
请帮忙!Great changes have taken place since we[ ]E-times.And th
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