最后的had been produced为什么用过去完成时,是不是因为were portrayed?另外为什么不用are而用were?Between 1897 and 1919,at least 29 motion pictures in which artificial beings were portrayed had been produced

最后的had been produced为什么用过去完成时,是不是因为were portrayed?另外为什么不用are而用were?Between 1897 and 1919,at least 29 motion pictures in which artificial beings were portrayed had been produced between 1897 and 1919 at least 29 motion pictures in which artificial beings were portrayed （had been produced）首先这个句子看不懂.然后我觉得motion pictures had been produced应该在artificial beings were portrayed 之后的 不应 my tongue was busy searching out the hole where the tooth had been,最后的had been是什么用法为什么要用过去完成时,省略的什么, had been和had been to的区别 had been的否定形式 have been / has been / had been 的区别 had been They set up a plant _ produced things _ had never been seen before.A.where,which B.which,that C.where,that D.that,where produced had been 和 has/have been的区别是什么? 初中英语语法has been和had been的区别 has been done,had been done 的区别是什么? have been to和had been to的区别 my tongue was busy searching out the hole where the tooth had been.这里最后的had been,为什么不用had done.这的 the hole where the tooth had been翻译是：刚拔掉的那颗牙的伤口,怎样理解这句话 have/had + been/be的区别是什么? 英语翻译这里的 Had 还有 been had been 的意思和用法? had been doing 和 had done的区别