问题
选择题
E-mail English is a new kind of written English that ______to save time.
A be being used B was being used C being used D is being used
答案
答案：D
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E-mail English is a new kind of written English that ______to save time.
A be being used B was being used C being used D is being used
答案：D
缺失，余留牙健康，前牙舌侧牙槽骨为斜坡形。