——Have you known each other for long?——Not very long,_____ we started to work in this company.A.sinceB.beforeC.whenD.after选哪个?为什么?

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——Haveyouknowneachotherforlong?——Notverylong,_____westartedtoworkinthiscompany.A.sinceB.beforeC.when

——Have you known each other for long?——Not very long,_____ we started to work in this company.A.sinceB.beforeC.whenD.after选哪个?为什么?
——Have you known each other for long?
——Not very long,_____ we started to work in this company.
A.since
B.before
C.when
D.after
选哪个?为什么?

——Have you known each other for long?——Not very long,_____ we started to work in this company.A.sinceB.beforeC.whenD.after选哪个?为什么?
A
问句是完成时,since是"自从.."的意思.