根据《建设工程质量管理条例》，属于建设工程竣工验收应当具备的条件有（）。

A、有完整的技术档案和施工管理资料

B、有勘察、设计、施工等单位分别签署的质量合格文件

C、完成建设工程设计和合同约定的主要内容

D、有施工企业签署的工程保修书

E、有工程使用的全部建筑材料、建筑构配件和设备的进场实验报告

The trip to the Mystery Caves will take place on Sunday, 27 July. You can book your tickets in Room 188 between 2:30 p.m. and 4:00 p.m. every day. Your parents should confirm (确认) the booking by writing to us as soon as possible. You should pay for the trip before 21 July. If we do not receive your money early enough, your booking will be cancelled(取消). If the trip does not take place for any reason, your money will be paid back.
We are planning to meet outside the railway station on Black Street at 8:00 a.m. It will take us about 2 hours to get to the center of the town by train, and from there we have to catch a bus. It will take another hour to get to the Mystery Caves on the bus.
We will spend about 1 hour and a half visiting the caves (山洞), and we hope to catch the 1:30 bus to Happy Lake for some swimming. If we are late, we will have to take the 3:00 bus straight back to Black Street.

If the trip to the Mystery Caves is cancelled, you will
[A] get your money back
[B] go there on another day
[C] go to Happy Lake instead