——could we play football in your playground,sir ——No,( )you have the principal"s note

问题描述:

——could we play football in your playground,sir ——No,( )you have the principal"s note
A;if B;unless C:because D;since

B
我们能在你的操场踢足球吗,先生?
不可以,除非,你们有校长的通知条.