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
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科目：高中英語 來源：模擬題 題型：單選題

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

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