问题
选择题
| As they ____ through the nature park, they saw some squirrels, a gang of monkeys and two deer. |
A. walked B. were to walk C. had walked D. were walking |
答案
答案：D
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| As they ____ through the nature park, they saw some squirrels, a gang of monkeys and two deer. |
A. walked B. were to walk C. had walked D. were walking |
答案：D