问题
选择题
______ his age, he was considered ______ well in the play.
A． Considering; acting
B． Considering; to have acted
C． Considered; acting
D． To consider; to act
答案
答案：B
考查非谓语动词。句意“考虑到他的年龄，他被认为演得很好。”逻辑主语是he，he与consider之间是主谓关系，排除C、D；be considered to do sth.“被认为......”。故选B。
缺失，
牙龈退缩，
剩余牙槽嵴较低，口底及前庭沟浅。
宜采用的卡环类型（）