题目内容

---How long have you been running ?  ---Since ______ .
A．two hoursB．two hours agoC．I am ten years oldD．for two hours
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。
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