问题
选择题
I find difficult to remember everything, though I'm still young. [ ]
A. that
B. this
C. it
D. its
答案
答案：C
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I find difficult to remember everything, though I'm still young. [ ]
A. that
B. this
C. it
D. its
答案：C
缺失，
近远中大面积银汞合金充填物，无松动，X线显示已行完善的根管治疗；未见明显的牙体牙髓及牙周病变