The Bunsen burner is so named because it is thought ______ by Robert Bunsen, who

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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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