Users open the door by () the app up to the lock or () a button on their phone screen.

科目名称：理工英语3

试卷号：11377

题型：词汇与结构(单选题)

题目：Users open the door by () the app up to the lock or () a button on their phone screen.

选项：A. holding ...tapping B. holding ...tap C. hold ...tapping

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答案：A. holding ...tapping