He noticed the helicopter hovering over the field. Then to his astonishment, he

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问题 He noticed the helicopter hovering over the field. Then to his astonishment, he saw a rope ladder ______ out and three men climbing down it.

选项 A、throwing
B、being thrown
C、having throw
D、having been thrown

答案 B

解析非谓语动词题。此题考查宾语补足语的用法。动词的现在分词形式用来表示动作与谓语动词动作同时发生，同时由于rope ladder是受动者，应当用被动形式，现在分词的被动形式为being done，故B 正确。

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