问题
选择题
Han Mei _________ her black bike.[ ]
A. isn't riding
B. not is riding
C. don't ride
答案
答案：A
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Han Mei _________ her black bike.[ ]
A. isn't riding
B. not is riding
C. don't ride
答案：A
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