Have a good look round the room to make sure you everything.
A. had packed
B. pack
C. have packed
D. are packing
网友回答
A. had packed
B. pack
(答案→)C. have packed
D. are packing
解析：句意：好好看一下房间确保把一切东西都放进了包里。这里看房间以前已经把东西放进包里，故用现在完成时；过去完成时必须有可以参照的过去的动作才行，故选C。