我怎么就理不顺这个句子？ 快来救命了！
The Bunsen Burner is so named because it is thought ______by Robert Bunsen. A. to be invented B. having been invented C. invented D. to have been invented
把这个复合句拆开，先从because分成两大块。because引导一个原因状语从句，前面的就不用管了。it is thought 是一个被动语态，后面可以跟宾语从句也可以跟to do不定式结构（和 it is believed，it is considered 一样）。故可排除选项B和C. 若答案仍选的是D，则说明本句还是要强调发明本森灯这件事发生在前。原句若省略it is thought，则变为it has been invented。。。加上 it is thought后则变为 it is thought to have been thought。这回懂了吗？谢谢
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