The tutor（导师）asked his students to leave a wide when typing their essays.A. border B. col

问题补充：

The tutor（导师）asked his students to leave a wide when typing their essays.

A. border

B. column

C. surrounding

D. margin

答案：

A. border

B. column

C. surrounding

D. margin

解析：

margin页边空白；border边界；column栏目；surrounding周围。故D为正确答案。句意：导师要求学生在打印他们的论文时页边空的地方留宽一点。