题目内容
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
A
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。
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题目内容
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
A
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。