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He_ playing football when his mother_to the hospital.A saw;took B.was seen;was taken Cwas seen;tooD是was seen;was taking 选哪个啊

题目详情
He_ playing football when his mother_to the hospital.A saw;took B.was seen;was taken Cwas seen;too
D是was seen;was taking
选哪个啊
▼优质解答
答案和解析
b