2. 外语
  3. The Bunsen burner is so named because it is thought______by Robert Bunsen, who was German by birth.

The Bunsen burner is so named because it is thought______by Robert Bunsen, who was German by birth.

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问题 The Bunsen burner is so named because it is thought______by Robert Bunsen, who was German by birth.
选项 A、to have been invented
B、to be invented
C、of being invented
D、as being invented
答案A
解析 to have been invented是不定式作主语burner的补足语，其相互关系是被动，相当于the burner was invented，所以用不定式的被动式，完成式表明invent这一情况已经发生。如果选C或D，应该是…is thought of as…"被认为是……"。
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