问题

______, he got a low mark in the exam— He _______ [ ]
A: He is stupid; never studies hard
B: Stupid as he is; always studies extremely hard
C: Clever as he is; never studies hard
D: Although he is clever; studies extremely hard
B: Stupid as he is; always studies extremely hard
C: Clever as he is; never studies hard
D: Although he is clever; studies extremely hard
正确答案是: