1. When does the train arrive? The teacher wanted to know.The teacher wanted to know ________ _____,空格是不是少了一个

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1. When does the train arrive? The teacher wanted to know.The teacher wanted to know ________ _____,空格是不是少了一个

1. When does the train arrive? The teacher wanted to know.The teacher wanted to know ________ _____,空格是不是少了一个
1. When does the train arrive? The teacher wanted to know.
The teacher wanted to know ________ _____,空格是不是少了一个

1. When does the train arrive? The teacher wanted to know.The teacher wanted to know ________ _____,空格是不是少了一个
The teacher wanted to know 【when the train arrived】

是的,貌似最少要三个吧。
可以是 the teacher wanted to know when it arrived=the teacher wanted to know its arriving time=the teacher wanted to know the time of the train's arrival...etc.
如果是作业,建议你留着问下老师或者跟同学交流下,个人意见,希望帮你解决问题。

when the train arrived,这是把两个句子合成一个宾语从句,从句要用陈述语序,即主语+谓语

如果是将这两个句子融合成一个复合句,我认为是这样变形,主要考察when,(when the train arrive).