2010届高考各省市模拟考试单项选择题分类汇编

适用年级：高一
试卷号：83038

试卷类型：高考模拟
试卷考试时间：2017/7/20

1.单项选择(共1题)

—Have you known each other for long?
—Not very long, ________ we started to work in the company.

A．after

B．before

C．when

D．since

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