The government has taken some measures to reconstruct the earthquake-hit areas, but it must be some time everything returns to normal.
A. since
B. after
C. unless
D. before
网友回答
A. since
B. after
C. unless
(答案→)D. before
解析：考查固定结构。It+be +some time+before….要过一段时间才。。。。句意：政府已经采取措施重建地震灾区，但是必须要过一段时间一切才能恢复正常。选D。