问题
单项选择题
He（）in the emergency room when I arrived at the hospital.
A．has been treating
B．has treated
C．had treated
D．was being treated
答案
参考答案：D
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He（）in the emergency room when I arrived at the hospital.
A．has been treating
B．has treated
C．had treated
D．was being treated
参考答案：D