They started to walk             they parked their bikes.

A. when
B. after
C. while
D. before
B
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科目:初中英語(yǔ) 來(lái)源:云南省期中題 題型:單選題

They started to walk             they parked their bikes.
[     ]
A. when
B. after
C. while
D. before

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