The boy___(set) off when his girlfriend came to the airport.

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The boy___(set) off when his girlfriend came to the airport.

The boy___(set) off when his girlfriend came to the airport.
The boy___(set) off when his girlfriend came to the airport.

The boy___(set) off when his girlfriend came to the airport.
首先set的三个时态是:set-set-set.
如果是"had set",意思就是:当男孩的女朋友到达机场时,他已经出发了.
由"came"可以得知句子的时态是"过去式",表示整件事发生在过去,而在当时的时间点(就是女孩到机场的时间点)boy已经在那之前就set off (出发)了,所以用过去完成式.
这是单纯的时态判断~

set
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