There is an ongoing debate about the potentially harmful effects ________ text messaging can have on people's grammar.
A．what 　B．who 　
C．that　D．whose
C
句意：有關發(fā)短信對人們語法的潛在危害的辯論正在進行。先行詞為the potentially harmful effects，在定語從句中作賓語，定語從句可還原為“text messaging can have potentially harmful effects on people's grammar”，且先行詞指物，故選that。
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