牙周病的局部促进因素不包括()
A.牙面及白垢
B.食物嵌塞
C.咬合创伤
D.酸、碱等化学刺激
E.不良充填物及修复体
参考答案:D
Do let your mother know all the truth. She appears _____ everything. [ ]
A. to tell
B. to be told
C. to be telling
D. to have been told
We forgot to bring our tickets,but pleaselet us enter, ____ ?
A. do you
B. can we
C. will you
D. shall we