The monument was built in honor of the explorer who was believed _____ the river
题型：不详难度：来源：
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 |
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答案
| A |
解析
| 用不定式的完成式表示动作发生在(定语)从句谓语动作之前。 |
举一反三
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