题目内容
An international treaty(条约)on tobacco tobacoo campanies to make public all the substances they use to make cigarettes has been now in effect.
A、calling up B、calling on C、calling in D、calling for
D

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题目内容
An international treaty(条约)on tobacco tobacoo campanies to make public all the substances they use to make cigarettes has been now in effect.
A、calling up B、calling on C、calling in D、calling for
D