When first ( ）to the market,their products enjoyed great success.
题目
When first ( ）to the market,their products enjoyed great success.
A.introducing
B.introduced
C.introduce
D.being introduced
答案
D.being introduced
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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