问题
选择题
The boy promised ______ late for school again.[ ]
A. to not be
B. not to be
C. not being
D. being not
答案
答案：B
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The boy promised ______ late for school again.[ ]
A. to not be
B. not to be
C. not being
D. being not
答案：B
大面积龋坏，牙冠剩余组织少，壁薄，根管治疗后要求修复治疗，最佳治疗方案为（）