用括号里所给词的适当形式(现在完成进行,过去完成进行或将来完成进行)填空,up to that time he ______________(translate) those books I wanted to know what ____________(go) onHe gave up smoking last year.He ___________(

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用括号里所给词的适当形式(现在完成进行,过去完成进行或将来完成进行)填空,up to that time he ______________(translate) those books  I wanted to know what ____________(go) onHe gave up smoking last year.He ___________(

用括号里所给词的适当形式(现在完成进行,过去完成进行或将来完成进行)填空,up to that time he ______________(translate) those books I wanted to know what ____________(go) onHe gave up smoking last year.He ___________(
用括号里所给词的适当形式(现在完成进行,过去完成进行或将来完成进行)填空,
up to that time he ______________(translate) those books  
I wanted to know what ____________(go) on
He gave up smoking last year.He ___________(smoke) for thirty years
请给我讲解一下,不知道如何来判断时态.

用括号里所给词的适当形式(现在完成进行,过去完成进行或将来完成进行)填空,up to that time he ______________(translate) those books I wanted to know what ____________(go) onHe gave up smoking last year.He ___________(

had been translating (过去完成进行时,理由是,up to that time, 到那时为止,说明“翻译”的动作在“那时”之前就有,一直持续到那时,而且还在进行.)

was going on (过去进行时,理由:wanted,这是个过去时; 另外,通过读整个句子,过去进行时要好一些,否则什么时态更好呢?问一问自己,应该没有.)

had been smoking (过去完成进行时,理由是,前一个句子中的 gave, 这是过去时,是去年的事,所以 smoke 是更早的过去一直持续到去年为止,“for + 时间段”表示时间延续 .)