The man sitting next to me on the plane was very nervous..It was his first flight.He ____(never,fly) before.为什么用had never flown 不用has never flown

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The man sitting next to me on the plane was very nervous..It was his first flight.He ____(never,fly) before.为什么用had never flown 不用has never flown
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The man sitting next to me on the plane was very nervous..It was his first flight.He ____(never,fly) before.为什么用had never flown 不用has never flown
The man sitting next to me on the plane was very nervous..
It was his first flight.He ____(never,fly) before.
为什么用had never flown 不用has never flown

The man sitting next to me on the plane was very nervous..It was his first flight.He ____(never,fly) before.为什么用had never flown 不用has never flown
had never flown 是过去完成时
也就是"过去的过去",相对于
it was的时候,再住前,不能用现在完成时.
如果是it is ,用has never flown

had never fiown不是现在动词

before是过去时,所以用had

本来叙述的就是过去的事,整个态都是过去的,没坐过飞机是过去的过去,所以……