The monument was built in honor of the explorer who was believed _____ the river.
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A
to have discovered   
B
to have been discovered
C
to discover  
D
having been discovered
推荐题目
Do you have any difficulty ________?
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A
on listening
B
to listening
C
for listening
D
in listening
_______our English teacher,our English has been greatly improved.
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A
Thanks to
B
Thank for
C
But for
D
Except for