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问题 单项选择题

女，25岁，全冠戴入后不久出现龈组织红肿、疼痛，最不可能的原因是（）

A．垂直性食物嵌塞

B．水平性食物嵌塞

C．修复体龈边缘过长

D．创伤

E．修复体轴面突度恢复不正确

答案

参考答案：D

选择题

She'll go there alone if I _____ free tomorrow.[ ]

A. don't be

B. not be

C. am not be

D. am not

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单项选择题

—Do you know that Jack () a postman for about six years

—Yes, I see.

A. has become

B. has turned

C. has changed

D. has been
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