Initially the writer did not want to buy a hearing aid because One special feature of Crystal Ear is that

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问题 Initially the writer did not want to buy a hearing aid because
One special feature of Crystal Ear is that

选项 A、you can control its volume.
B、you needn’t take it off every day.
C、it is solar-powered.
D、it saves power.

答案D

解析

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职称英语卫生类B级

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