China Hengda＿well have won the football match but I don't know because I wasn't there.A.

问题补充：

China Hengda＿well have won the football match, but I don know because I wasn there.

A. could

B. may

C. should ．

D. must

答案：

A. could

(答案→)B. may

C. should ．

D. must

解析：句意：中国恒大很有可能已经赢得了足球比赛，但是我不知道因为我当时不在。May will have done很有可能已经做了…，could“能够”，should“应该”，must“必须”，这几个情态动词都不和well连用，所以选B。