激励一保健理论的提出者是美国心理学家
A．马斯洛
B．莱维特
C．赫兹伯格
D．麦克莱兰
参考答案：C
—Are you going to help John with his Chinese this evening?
—No, He ________ to England. He will be back next month. [ ]
A. returned
B. has returned
C. returns
D. will return
修复前需做的牙槽骨的处理不包括（）
A.消除有碍的骨突
B.骨性隆突修整术
C.前庭沟加深术
D.牙槽嵴重建术
E.修复牙槽窝
