题目

 We tried to find a table for seven, but they were all ______.    A. given away      B. kept away      C. taken up      D. used up 答案：C如图，∠1=∠ABC 由∠1=∠ABC能得到AB∥CD吗？若能请说明理由；若不能，请写出一个与∠1有关的条件使AB∥CD。