The mobile phone is an important tool of ——(communication) nowadays用所给词的适当形式填空

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The mobile phone is an important tool of ——(communication) nowadays用所给词的适当形式填空
The mobile phone is an important tool of ——(communication) nowadays
用所给词的适当形式填空

The mobile phone is an important tool of ——(communication) nowadays用所给词的适当形式填空
communication 手机是现在的重要的交流的工具.

communication
因为communication不可数,不加s