2. 专升本
  3. Bunsen burner is so named because it is thought________by Robert Bunsen.

Bunsen burner is so named because it is thought________by Robert Bunsen.

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问题 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 sb. /sth. be thought to do sth. 为固定用法，意为“某人/某物被认为做某事”。根据句意可知，invent所表示的动作发生在is thought所表示的动作之前，且invent与it(指代Bunsen burner)之间是逻辑上的动宾关系，所以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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