问题: 请教一道单选题。
The Bunsen Burner is so named because it is thought ____ by Robert Bunsen.Who was German by birth.
A.to be invented B.having been invented
C.invented D.to have been invented
解答:
答案选d
be thought to do : 被认为做某事
The Bunsen Burner 是被发明的，所以应该是 be invited
因为发明这个动作应该是在前发生，然后才会有被确认的，所以应该用完成时态表示动作的先后关系，所以答案是to have been invited
这个类型的题目高考也有：
the computer is thought to have been invited by him
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