The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.
A．to be inventedB．having been invented
C．inventedD．to have been invented
D
本句考查動詞的被動語態(tài)和時態(tài)，it+is+動詞ed形式，to do是固定的搭配用法。而Bunsen Burner的發(fā)明是過去發(fā)生的動作，所以用完成時態(tài)。
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