While _____ the dog last night, I met with Mary.

A. walk
B. walked
C. walking
D. to walk
C
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科目:高中英語(yǔ) 來(lái)源:河北省月考題 題型:單選題

While _____ the dog last night, I met with Mary.
[     ]
A. walk
B. walked
C. walking
D. to walk

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