China’s foreign trade has improv

China’s foreign trade has improved substantially since its reform and open policy.
A、fast
B、confidently
C、excellently
D、considerably
【正确答案】：D
【题目解析】：substantially意为“大体上，充分地“；fast快的；confidently自信地；excellently优秀地；considerably相当地，非常地；故选D。