第二部分 英语知识运用（共两节，满分45分）
第一节 单项选择(共15小 题；每小题1分，共15分)
21．Mr．Green stood in defence of the 16-year-old boy, saying that he was not the one
_________．
A．blamed B．blaming C．to blame D．to be blamed
22．Leave your key with a neighbor __________ you lock yourself out one day．
A．ever since B．even if C．soon after D．in case
