问题描述：
-What do you thinkof the Chinese language today -quite popular
it __in communicating with other countries
A plays an important role B is playing an important role
为什么选B,A,B的效果有什么不同
it __in communicating with other countries
A plays an important role B is playing an important role
为什么选B,A,B的效果有什么不同
问题解答：
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