as引导让步状语从句“通常如果从句中有形容词或名词作表语,则把表语置于句首,而且名词前要省略冠词；如果从句中有修饰动词的

as引导让步状语从句
“通常如果从句中有形容词或名词作表语,则把表语置于句首,而且名词前要省略冠词；如果从句中有修饰动词的副词,则将该副词置于句首；如果从句中有情态动词,则将情态动词后的动词原形置于句首”这是 我从语法书上看到的,如果既有情态动词又有表语形容词或表语名词时怎么办?比如
_________,he talks a lot about his favorite singers after class.
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
照那么说c这个奇怪的答案是不是对呢?但我知道B答案是正确的,但c又错哪了?