杨鹏难句100th

chasedreamtrue

Although it has been possible to infer from the goods and services actually produced what manufactures and servicing trades thought their customers wanted，only a study of relevant personal documents written by actual consumers will provide a precise picture of who wanted what

   尽管有可能从实际制造的商品和服务中可推知制造商和服务业认为他们的顾客所需要的是什么，但只有对由实际顾客撰写的相关的个人文件进行一番研究，方能提供一幅精确的图画，藉以说明“什么样的人”需要什么样的东西。

正常语序应该是：to infer what manufactures and servicing trades thought(?think) their customers wanted from the goods and services actually produced

问题:在这里的thought是动词?那末就应该是think,因为整个句子是现在的时态.帮忙分析一下