题文
While ___ along the street, I met an old friend of mine.
| A．I walking |
| B．was walking |
| C．I am walking |
| D．walking |
推荐试卷
While ___ along the street, I met an old friend of mine.
| A．I walking |
| B．was walking |
| C．I am walking |
| D．walking |
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