问题
选择题
---How long have you been running ? ---Since ______ .
A.two hours
B.two hours ago
C.I am ten years old
D.for two hours
答案
答案:B
考查情景交际。“你跑了多久了?”“自从......”since加时间点,排除A、D;B“连小时以前”;C“我十岁那时”,C不合题意。故选B。