Radios today seldom need ______ or the attention of a technician.

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问题 Radios today seldom need ______ or the attention of a technician.

选项 A、to repair
B、repaired
C、repairing
D、to have repaired

答案C

解析 need doing something为固定搭配,有被动语态to be done的意思。其他的选择项都不符合语法规则。
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