since的用法主要有两点：一是表示“自从……以来”,二是表示“既然”之意
所以用到since一般表示已经完成的动作
而这个句子中应该填一个表示“如果”的词语
所以应该填if 不填since
问道高中英语题~~______you have a complaint to make,do something rig
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