______ his telephone number, she didn’ t know how to get in touch with him.

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问题 ______ his telephone number, she didn’ t know how to get in touch with him.

选项 A、Having forgotten
B、To have forgotten
C、Forgetting
D、To forget

答案A

解析 forget与其逻辑主语she之间为主谓关系,应用现在分词。且forget这一动作发生在主句动作发生之前,所以应用现在分词的完成式。故选A。
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