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、having been invented
B、to be invented
C、to have been invented
D、being invented
答案C
解析 本句是It is thought that．．．这一句型的变体。由于不定式的动作发生在“It is thought…”之前，因此不定式采用完成式。另外，这里的“让”指代“The Bunsen burner”而不是充当形式主语。
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