在由though, as引导的让步状语从句中，如果从句的表语是可数名词单数，将名词提前时，名词前面的冠词a 须省略。如：
Child as [though] he is, he knows much about the society. = Though he is a child, he knows much about the society. 尽管他还是个小孩，他对社会的了解不少。
请看两道试题：
1. _________ as it is, it can understand you.
A. A dog B. Dog C. Dogs D. The dog
2. _________, he talks a lot about his favorite singers after class. (重庆卷)
A. A quiet student as he may be B. Quiet student as he may be
C. Be a quiet student as he may D. Quiet as he may be a student
【分析】根据前面的分析，这两道题的答案均为B。