关键词汇是KEYS,因此需要用为were,而不是was.如果将句子改一下,就变为：There were keys to the problem on the board written by the teacher.如果句子为：what the teacher had wortten on the board {was}a key t...
一个英语句子 主语的疑问what the teacher had wortten on the board {were}
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