When television was first (introduced), the extent to (that) it would (affect) society could not (have been foreseen).

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问题 When television was first (introduced), the extent to (that) it would (affect) society could not (have been foreseen).

选项 A、introduced
B、that
C、affect
D、have been foreseen

答案B

解析应为which。本句中to为介词，介词后的关系代词不可以用that替代which。

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