发生特大事故时，应立即将发生特大事故的情况报告上级归口管理部门和所在地地方人民政府，并报告所在地的省、自治区、直辖市人民政府和国务院归口管理部门。并于24小时内写出书面事故报告，报送上述部门。( )

Jenny is on holiday now. I wonder ______________________.

A．when she will come back

B．when she came back

C．when will she come back

D．when did she come back