If one of your friends sends you a message to borrow money on the Internet, you'd better phone him first ________ sure

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1. (2021高一上·重庆开学考) If one of your friends sends you a message to borrow money on the Internet, you'd better phone him first ________ sure of that.

A . to make B . making C . make D . made

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重庆市七校2021-2022学年高一上学期入学摸底考试英语试题