几道单选题.1．It was three years ago＿ her father returned from Ame

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几道单选题.
1．It was three years ago＿ her father returned from America.
答案是that.请问划线的that为什么不能填when,这两个词在这种题型里要怎么区分?
2．The news will be ＿ at 6 in the afternoon.
A.on the air B,in the air C.on air D.in air
请问这几个词组都是什么意思?

1,这是强调句型,即it is/was+强调部分+that+剩余部分
在这种句型中,除了who可以和that换之外,都只能用that
判断强调句,只要把It is/was that这几个词去掉,如果仍是一个结构完整语法正确的句子,那就是强调句
2,on the air 在广播
in the air 在空中
by air通过航空
其他就没了

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