过去完成时与过去完成进行时 — 英语词汇题
题目
用括号中动词的过去完成时或过去完成进行时填空。When the curator opened the sealed chamber at 4 p.m., the team was exhausted because they ___ (search) the ruins since dawn, and they ___ (find) no entrance until a local guide showed them a hidden passage.