-My father with my grandparents _______ Shanghai.

-Really? _______ will they come back?

A．have been to; How soon

B．has been to; How long

C．has gone to; How soon

D．has gone to; How long

医学伦理学公正原则的本质是对病人（）

A.充满爱心

B.细心负责

C.一视同仁

D.耐心周到