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  3. The Bunsen Burner is so named because it is thought _____ by Robert Bunsen.

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 语法题。本题考查的是被动语态和be thought to have done的用法。Bunsen Burner是被发明，需要用被动语态，所以排除答案C。be thought to do是固定用法，表示被认为，因为该灯的发明者是罗伯特-邦森，造成的结果是灯以他的名字命名，所以需要用现在完成时，所以答案是D。本句意为：本生灯之所以叫这个名字是因为它被认为是由罗伯特-邦森发明的。
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