题目内容
8．They weredigging（挖）holes to plant trees when we got to Yingtai Park．分析 当我们到达英泰公园时他们正在挖洞植树．
解答 答案：digging．根据句意和汉语提示得知挖掘用dig，再者当他们到达英泰公园时他们是正在做某事，故用过去进行时，过去进行时的构成是was/were+动词的现在分词，这里dig的现在分词是digging，故答案是digging．
点评 本题需要先理解句意得出信息词，再根据时态得出正确答案．
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