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The monument was built in honor of the explorer who was beli

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The monument was built in honor of the explorer who was believed__the river.
a.to have discovered b.to have been discovered
c.to discover d.having been discovered
能解释一下意思和为什么要选择这个答案吗?
The monument was built in honor of the explorer who was beli
a
这座纪念碑被认为是为纪念发现这条河的探险家而建造的.
be believed to have done为认为做过某事