Question

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

Answer 1

C

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。