Could you tell me the radio without help?A. how did he mend B. what did he mend C. how he

问题补充：

Could you tell me the radio without help?

A. how did he mend B. what did he mend C. how he mended

答案：

解析：句意:你能告诉我，在没有帮助下他是如何修理收音机的？在本句中，疑问代词放在句子之中，它所引导的句子要用陈述语句，而A和B选项中都有did,不是陈述句，所以排除。故选C。