Tom ang his parents_________(arrive)in Beijing in three days,aren't they?are ariving为什么不能用are going to arrive?并说明in three days的用法及意义!

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Tom ang his parents_________(arrive)in Beijing in three days,aren't they?are ariving为什么不能用are going to arrive?并说明in three days的用法及意义!
Tom ang his parents_________(arrive)in Beijing in three days,aren't they?
are ariving
为什么不能用are going to arrive?
并说明in three days的用法及意义!

Tom ang his parents_________(arrive)in Beijing in three days,aren't they?are ariving为什么不能用are going to arrive?并说明in three days的用法及意义!
此句中are arriving运用一般现在时表示将来
而be going to结构表示将来的打算
在这里,本句译为“汤姆和他的父母三天内就要来北京了,不是吗?”
所以,用are arriving更好些

be+Doing
将来进行。