All their attempts to rescue the child from the burning building were and he died soon.A

问题补充：

All their attempts to rescue the child from the burning building were , and he died soon.

A. in place

B. in return

C. in vain

D. in ruins

答案：

A. in place

B. in return

(答案→)C. in vain

D. in ruins

解析：A. in place在适当的位置，B. in return做为回报，C. in vain徒劳，D. in ruins成为废墟，句意：所有的救援着火的房子里面孩子的努力都徒劳，他很快就死了。根据句意选C。