摘要:第一节单项填空(共15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.Although their new factory building is still under construction.we have already placed order for 200 pairs of shoes. A.the; an B.a:an C./,/ D./,an

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