you have nothing important to do why not come with me to the cinema?A. SinceB. WhenC. Fo

问题补充：

you have nothing important to do, why not come with me to the cinema?

A. Since

B. When

C. For

D. Because

答案：

(答案→)A. Since

B. When

C. For

D. Because

解析：since 在此处表示既然的意思。