一位当代西方史学家说：“西欧国家希望通过建立一个经济共同体，来振兴经济并降低未来战争的可能性。”目前由欧洲国家组成的世界上最大的经济实体是 [ ]

A．国际联盟

B．欧洲联盟

C．亚太经合组织

D．七十七国集团

What would have happened ________, as far as the cliff?

A．if Bob has walked farther

B．if Bob should walk farther

C．if Bob had walked farther

D．if Bob walked farther