下列哪项不是宣白承气汤中的药物（）

A.石膏

B.知母

C.生大黄

D.杏仁

E.瓜蒌皮

—My goodness! The accident might not have happened if we had done it more carefully.

—But we      .

A．haven’t

B．wouldn’t

C．hadn’t

D．didn’t