It was the first time that I had seen his film.

It was the first time that I had seen his film.
这句话是定语从句还是强调句型?二者如何区分?
the first time 在句中作什么成分?

I had seen this film 为什么要用过去完成时?

不是强调句,是it 引导的主语从句：考察句型This/it is/was the first time that sb have/had done sth
it做形式主语,代表的是that后面的那个句子；that前半句是（主系表）,the first time在这里做标语；
前面用过去式was,后面使用过去完成时表示过去已经做完的事情.

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