— Linda shall we go and watch the Flower Festival Party in April?— we have the tickets.A

问题补充：

— Linda, shall we go and watch the Flower Festival Party in April?

— we have the tickets.

A. If

B. Unless

C. Because

D. Since

答案：

A. If

(答案→)B. Unless

C. Because

D. Since

解析：A. If 假如B. Unless 除非，只要 C. Because 因为 D. Since自从；句意：琳达，四月份，让我们去看花卉展览吧。只要我们有门票。故选B