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问题 单项选择题

在给无牙颌患者初戴全口义齿时，出现前牙开，不可能的原因()

A．人工牙变位

B．上下颌基托远端有早接触

C．患者错位

D．后牙区咬合高

E．患者不会用义齿咬合

答案

参考答案：E

选择题

I still remember how many years _____ was that I quarrelled with her for the first time.

A．when

B．this

C．that

D．it
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选择题

—Where is Grace?

—She _____ in the yard.[ ]

A. reads            

B. read

C. is reading        

D. was reading
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