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
It took the police a long time to find some evidence. The new evidence led to _______.
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A
the robber having caught
B
catch the robber
C
the robber being caught
D
the robber to be caught
After the flood, no house in the village _____.
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A
left standing
B
was left to stand
C
was remained standing
D
remained standing