问题
选择题
—You used to be quiet, _____ you?
—Yes, and I used to be very shy. [ ]
A. wasn't
B. didn't
C. aren't
D. haven't
答案
答案：B
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—You used to be quiet, _____ you?
—Yes, and I used to be very shy. [ ]
A. wasn't
B. didn't
C. aren't
D. haven't
答案：B
因慢性牙髓炎就诊，根管预备过程中发现4个根管均狭小，15号根管锉难以进入根尖1/3，可行的治疗方案是（）