自从地球有人类居住以来，流行病就时有发生。 Epidemics have been happening for as long as there have been people living on Earth.Epidemics have been happening for as long as there have been people living on Earth.
【考点】现在完成进行时．
【答案】Epidemics have been happening for as long as there have been people living on Earth.
【解答】
【点评】
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发布：2024/4/20 14:35:0组卷：3引用：2难度：0.7
