问题
选择题
It is important _______ and helpful. [ ]
A. to kind
B. kind
C. be kind
D. to be kind
答案
答案：D
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It is important _______ and helpful. [ ]
A. to kind
B. kind
C. be kind
D. to be kind
答案：D
因外伤冠折，根管治疗后要求修复，检查：见