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题目内容
（兰州交通大学-土木工程-大学英语3）
When the street, he noticed the old man.
得分/总分
A.
he passes
B.
he passing
C.
being passing
D.
passing
得分/总分
A.
he passes
B.
he passing
C.
being passing
D.
passing
参考答案