1.Facts prove that the world’s economic development is not a win―lose game but one in which all _____be winners.

A.     can              B.shall              C.must           D.would

【解析】A：本句想说明：经济发展是一种双赢或多赢的游戏，can 此处为情态动词表“能够”或“有时候会”之意。