既有囊肿的某些特征又有肿瘤特征的是（）
A.成釉细胞瘤
B.牙源性钙化上皮瘤
C.牙瘤
D.牙源性钙化囊肿
E.牙源性黏液瘤
参考答案：D
Polly said that he did everything ______ she could to comfort his sister who cried after being refused by Harvard.
A．what
B．which
C．when
D．that
（）规定合同当事人可以是公民，也可以是其他组织。
A.合同法
B.建筑法
C.安全施工条例
D.建设工程质量管理条例
