my dentist had just pulled out one of my teeth.为什么要用过去完成时而不用

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my dentist had just pulled out one of my teeth.为什么要用过去完成时而不用现在完成时呢?
说的详细点.

过去完成时强调：“过去的过去”.表示在过去某一动作之前发生、或完成.注意上下文,肯定可以找到一个过去时态的谓语动词.
再问：那为什么不用过去式呢？过去完成时不是有个与过去时间的对比呢，这没有啊 Dentists always ask questions when it is impossible for you to answer. My dentist had just pulled out one of my teeth and had told me to rest for a while. I tried to say something, but my mouth was full of cotton wool. He knew I collected match boxes and asked me whether my collection was growing这位是课文的前半段

You had one of your teeth pulled out yesterday,____? 为什么最后用had fallen 过去完成时,而不用过去式? A ___(care) doctor pulled out one of her good teeth 根据句意写单词 i ()one of my teeth taken out.i feel much better now I had cut my finger when I was cooking 这里主句为什么要用过去完成时? He looked as if he had just stepped out of my book of fairy My shoes were wore out.为什么回答要用Let me have a look at it,而不用Ca I informed my boss of my arrival in Tokyo.为什么用informed.而不用完成英语翻译Last time I had a flat tire ,I pulled my truck into one you just walked out of my i brush my teeth twice a day 为什么要用teeth而不是tooth 初二英语题my mother go to dentist for teeth _____（clean）用适当形式填空原