—Are you coming to Jeff's party?—I'm not sure.I go to the concert instead.A. mustB. would

问题补充：

—Are you coming to Jeffs party?

—Im not sure.I go to the concert instead.

A. must

B. would

C. should

D. might

答案：

A. must

B. would

C. should

(答案→)D. might

解析：

根据Im not sure判断，表示说话者不确定，有可能去音乐会。might表示“可能”；must表示“必须，一定”；would表示“将，愿意”；should表示“应该”。