We should check our papers before we hand in them ,________ ________RT,这里应该填shouldn't we 还是didn't we.还有,什么时候填另外一个?

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We should check our papers before we hand in them ,________ ________RT,这里应该填shouldn't we 还是didn't we.还有,什么时候填另外一个?
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We should check our papers before we hand in them ,________ ________RT,这里应该填shouldn't we 还是didn't we.还有,什么时候填另外一个?
We should check our papers before we hand in them ,________ ________
RT,这里应该填shouldn't we 还是didn't we.还有,什么时候填另外一个?

We should check our papers before we hand in them ,________ ________RT,这里应该填shouldn't we 还是didn't we.还有,什么时候填另外一个?
shouldn't we.因为主句中所引用的助词为should,
在句子中没有助动词,系动词,情态动词时就只能借用助动词了,也就是用didn't we的时候.