问题描述:
英语翻译
A student can click on the button at any time in the lesson.The second time the student clicks on the button,the page displayed when the button was first clicked with return to the screen.
A student can click on the button at any time in the lesson.The second time the student clicks on the button,the page displayed when the button was first clicked with return to the screen.
问题解答:
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