The Bunsen Burner is so named because it is thought ________

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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D

本句考查动词的被动语态和时态，it+is+动词ed形式，to do是固定的搭配用法。而Bunsen Burner的发明是过去发生的动作，所以用完成时态。

1年前

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