1、A
as表示“尽管/虽然”引导让步状语从句时,从句一般倒装.
如果是名词提前,即使其前有形容词修饰,也不用冠词.
2、C
such单独做表语时,其意思是“这样的人/物”,此时句子可完全倒装.
so是副词,不能单独做句子表语.
3、C
如果句子主语是名词（短语）,谓语动词是不及物动词,此时可把做状语的副词/介宾短语提前,然后把主语谓语完全倒装.
即：out rushed the boy = the boy rushed out
4、C
即：next door to ours lives an old man = an old man lives next door to ours
5、C
.固定短语be supposed to do sth = should do sth,意思是“应该/应当做某事”,排除BD；
be supposed to have done sth = should have done sth,意思是“本应该/应当做某事”,隐含“实际上没有做”之意.
6、C
副词性短语a little修饰固定短语ahead of time,表程度“一点点/稍微”.