A UFO was reported______ last night by many people.A、to be seenB、to have been s

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问题 A UFO was reported______ last night by many people.

选项 A、to be seen
B、to have been seen
C、having been seen
D、having seen

答案 B

解析句意：据报道，昨晚很多人看到了一个不明飞行物。考查语法。两个动词之间用to连接，而see这一动作发生在report之前。

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