My boss is expecting your reply. I would appreciate ______ back this afternoon. [ ]

A. you to call       

B. you call        

C. you are calling   

D. your calling

机器系统出现故障时，资金汇划应急业务由（）负责处理和管理

A、发、收报经办行

B、发、收报清算行

C、发报清算行

D、收报清算行