The Bunsen Burner is so named because it is thought by Robert Bunsen. A. to be invented B. having been invented C. invented D. to have been invented 题目和参考答案——青夏教育精英家教网—

题目内容

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

A. to be invented B. having been invented

C. invented D. to have been invented

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

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