Learning a foreign language well is not easy ?A. is itB. isn’t itC. does itD. doesn’t it

问题补充：

Learning a foreign language well is not easy, ?

A. is it

B. isn’t it

C. does it

D. doesn’t it

答案：

A. is it

(答案→)B. isn’t it

C. does it

D. doesn’t it

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