Only when Michael had his own child ____ making a kid grow up healthily was too hard.

A．he realized

B．had he realized

C．did he realize

D．he had realized

查找特定格式，应（）。

A、输入格式内容

B、单击格式按钮

C、删除“查找内容”框内文本，选择所需格式

D、查找格式类型