问题
The _______ income of the common people has beengreatly increased in the past thirty years ______ the reform and opening-uppolicy in China.
A:regularbecause
B:usual thanksto
C:normal on anaccount of
D:annual owingto
B:usual thanksto
C:normal on anaccount of
D:annual owingto
正确答案是：
同类题型
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