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weinsistedthathewasseriouslyillandthatadoctorbesentforatonce为什么这句里单数被动语态besent用be而不用istheygottwofreeticketstoCanda.otherwise,they'dneverhavebeenabletoaffordtogo.这句中对过去的

题目详情
we insisted that he was seriously ill and that a doctor be sent for at once 为什么这句里单数被动语态 be sent 用be 而不用is
they got two free tickets to Canda .otherwise,they'd never have been able to afford to go.这句中对过去的事实假设应该用过去完成式,为何这里用过去式 got 而不用过去完成式 had got
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答案和解析
insist be要求做什么,但没做,要是is那就是做了,事实好像还没请医生
had got和got有区别吗,没有区别吗?有吗,没有吗……