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根据课文内容选词填空
Text messages are much cheaper than ________(to talk on; talking on)a mobile phone, and you can make it even cheaper by shortening the words that you use.
答案:talking on
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根据课文内容选词填空
Text messages are much cheaper than ________(to talk on; talking on)a mobile phone, and you can make it even cheaper by shortening the words that you use.