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There is an ongoing debate about the potentially harmful effects ________ text messaging can have on people's grammar.

Awhat  Bwho  

Cthat Dwhose

 

C

【解析】句意:有关发短信对人们语法的潜在危害的辩论正在进行。先行词为the potentially harmful effects,在定语从句中作宾语,定语从句可还原为“text messaging can have potentially harmful effects on people's grammar”,且先行词指物,故选that

 

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