单项选择。

The poor little boy often stands _____ the gate. He is waiting for his mother. [ ]

A. in front of

B. in front the of

C. in the front of

D. front of

待装单管控中，下列哪些是开通详情中的内容（）

A.定单详情

B.定单群组

C.定单流程

D.定单级别