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题目内容
（兰州交通大学-土木工程-大学英语3）
When ________ in the dark, he got lost.
得分/总分
A.
walking
2.00/2.00
B.
have walked
C.
walked
D.
being walking
得分/总分
A.
walking
2.00/2.00
B.
have walked
C.
walked
D.
being walking
参考答案
