John spoke through a microphone so that he ________ in every room. ( 章节：1 难度：3)
- A、could hear
- B、had been heard
- C、could be heard
- D、heard
正确答案:C
答案解析:有
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John spoke through a microphone so that he ________ in every room. ( 章节：1 难度：3)
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