摘要:第一节:单项填空(共15小题.每小题1分.满分15分) 从A.B.C.D四个选项中.选出可以填入空白处的最佳选项.21.--- There was once time the farmers suffered a lot. --- Yes. They had to leave their land and find new jobs to earn a living. A.a; which B.a; when C.the; that D.the; then

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