问题
选择题
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
答案
答案：D
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。