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he would bark until someone opened the gate.that's what he__

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he would bark until someone opened the gate.that's what he____.1 is used to doing 2 used to do
请问选择哪个,及说出每个为什么对与错
he would bark until someone opened the gate.that's what he__
选 2 used to do 意思是:过去常常做的事
be used to doing 意思是:习惯做某事,意思似乎对,但时态有问题,因为前面的句子里,都是用的过去时,表示是以前发生的事,但1选项中,用的是一般现在时,肯定不对
翻译:他会一直叫,直到有人来给他开门.这就是他以前经常干的事.