— Have you known each other for long?
— Not very long, ____ we started to work in the company.
A．a(chǎn)fterB．beforeC．whenD． since
D。
since 是從屬連詞,引導時間狀語從句,常與現(xiàn)在完成時連用。題中答語為省略句,補全為:We haven’t known each other very long. We have known each other since we started to work in the company.  
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