The government has taken some measures to solve the problem of unemployment but it may be

问题补充：

The government has taken some measures to solve the problem of unemployment, but it may be some time the situation becomes better.

A. before

B. since

C. after

D. unless

答案：

(答案→)A. before

B. since

C. after

D. unless

解析：考查连词用法。“It be+一段时间+before…”是固定结构，该结构的意思是“要过……（长）时间才……”。when“．．．．．．的时候”；since“从．．．．．．开始”；unless“除非”；根据题意：政府已经采取措施解决失业问题，但是还要一段时间形势才能缓解。D最佳。