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 |
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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 |
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