Question

The monument was built in honor of the explorer who was believed＿＿the big river.

A．to have discovered	B．to have been discovered
C．to be discovered	D．having been discovered

Answer 1

A

试题分析：考查不定式的完成式：句意：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，因为探险家已经发现了这条河，用不定式的完成式，选A。