If I had been a little more careful, I _______the wallet behind.

A．won't leave

B．hadn't left

C．didn't leave

D．wouldn't have left

由于国外成本的下降，我国某种钢材的进口数量出现突发性大幅度增加，使我国的钢材生产商大受损失。为合法保护我国厂商，我国可引用世界贸易组织的（）。

A.反补贴规定

B.反倾销规定

C.国民待遇规定

D.保障措施规定