They didn't go to bed          they finished their homework. [ ]

A.until

B.because

C.when

D.if

请根据以下描述完成判断题以下问题。
无锡一新成立的服装生产企业向日本出口一批男式衬衣(检验检疫类别为m/n)，纸箱包装，出境口岸上海。

如果日本客户要求提供品质证书，应向无锡检验检疫机构提出申请。 ( )