题目

----Why are you late ? ----sorry, the bus I took ______ the mud for half an hour, so I had to walk here. A. had stuck in  B. has stuck in  C. was stuck in  D. has been stuck in 答案：C已知a=2003，b=2002，则a2-2ab+b2-5a+5b+6的值为A．1 B．2 C．3 D．4