All the attempts to rescue the child from the burning building were ________．He died soon afterwards

All the attempts to rescue the child from the burning building were ________．He died soon afterwards．

A.in place

B.in return

C.in vain

D.in order

答案及解析： C

解析：

从着火的大楼里把那个男孩救出来的一切努力都白费了。