The Bunsen Burner is so named because it is thought__________by Robert Bunsen.

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问题 The Bunsen Burner is so named because it is thought__________by Robert Bunsen.

选项 A、to be invented
B、having been invented
C、invented
D、to have been invented

答案D

解析 be thought to do sth.为固定用法,意为“被认为做某事”。另外,动词不定式中invent所表示的动作发生在is thought所表示的动作之前,所以应用不定式的完成式。根据句意可知,invent与it(The Bunsen Burner)之间是逻辑上的动宾关系,因此应用不定式的完成被动式,即“to have been +过去分词”的形式。故选D。
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