问题描述：
求以下英语句子的成分分析,最好说出是什么种类和句型
1.Two men took the parcel off the plane and carried it into the Customs House.
2.While two detectives were keeping guard at the door,two others opened the parcel.
3.To surprise,the precious parcel was full of stones and sand.
1.Two men took the parcel off the plane and carried it into the Customs House.
2.While two detectives were keeping guard at the door,two others opened the parcel.
3.To surprise,the precious parcel was full of stones and sand.
问题解答：
我来补答展开全文阅读