Solders were_____up and down outside the government buildings

题目

Solders were_____up and down outside the government buildings

答案

我觉得这里应该填上动词walking,表示现在进行时,而且walk up and down：来回走着,在这里符合句子的语境和意义,翻译如下；
士兵们正在政府办公大楼外面来回走着.