问题
选择题
Our English teacher, having explained to us how to design a project, allowed us a whole week’s preparation and then the class.
A．to dismiss
B．dismissed
C．dismissing
D．having dismissed.
答案
答案：B
本题考查动词时态。根据主句动词allowed为一般过去时态，and后的动作是顺成关系，故也用一般过去时。选B。
缺失，余留牙正常，下前牙舌侧龈缘至舌系带根部距离5mm。铸造支架式义齿的大连接体可选（）。