塑料甲冠不可用于（）
A.修复前牙过小牙
B.修复前牙切角缺损
C.暂时性修复体
D.诊断性修复体
E.修复磨牙外形
参考答案：E
You ____ finish the work today, for you still have three days left. [ ]
A. won't
B. mustn't
C. can't
D. needn't
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