—Steve  _______  come back because the window is open．

   —Yes．but he _______left it open last night．

 A．must have；might have       B．might have；can’t have

 C．can have；should have       D．might；must have

練習(xí)冊系列答案
相關(guān)習(xí)題

同步練習(xí)冊答案