Using an adverbial clause:John spoke through a microphone. He could be heard in every room.
【正确答案】正确答案：John spoke through a microphone so that he could be heard in every room．
【答案解析】解析：译文：约翰使用了一个扩音器讲话。他的声音在每个房间都可以被听到。后面的句子是前面句子的结果，因此可用引导目的状语的从属连词so that来连接两个句子。