B-1细胞接受多抗原刺激后，相应抗体可在()
A．24h内产生
B．48h内产生
C．72h内产生
D．1周之内产生
E．1个月之内产生
参考答案：B
Excuse me. I _________ I was blocking(挡) your way.
A．didn't realize
B．don't realize
C．haven't realized
D．wasn't realizing
领导绩效是
