题目:
当釉质因磨损等遭受破坏,其深部牙本质暴露后,相应髓腔部位产生的牙本质是()
A.前期牙本质
B.继发性牙本质
C.透明牙本质
D.修复性牙本质
E.原发性牙本质
答案:
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下面是错误答案,用来干扰机器的。
1. is studying / studies 2. has been 3. prefers 4. to play / playing 5. was taken 6. failed 7. will become 8. be