英语问题新概念英语第3册第一课有句话搞不清楚.The experts were now fully convinced

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英语问题
新概念英语第3册第一课有句话搞不清楚.
The experts were now fully convinced that the animal was a puma,but where had it come from?
在这里where had it come from?这个where后为什么用had啊?为什么不直接用it呢?
谢谢

过去完成时.
“专家们确信这个动物是美洲豹”这个动作是发生在“美洲豹出现”在之后的,"相信"用的是过去时,所以美洲豹的出现就发生在过去的过去,用过去完成时

英语问题新概念英语第3册第一课有句话搞不清楚.The experts were now fully convinced 新概念3第一课中有句话不明白,the experts were now fully...为什么now可以用于一般过去时? 新概念上的一道选择题The experts were now fully convinced that the anim The experts were now fully convinced 句中为何加were 做什么成分 the experts were now fully convinced that the animal was a p the experts were now fully convinced that the animal ___a pu The experts were fully convinced that the animal ________a p experts were convinced that the animal was a puma.experts we 新概念英语第一册 95课时有句话：we had better go back to the station now.这新概念英语第一册第一课简单陈述句语序问题《新概念英语》第3册第一课的课文翻译新概念英语2第18课的第一句是否有问题?