题目列表(包括答案和解析)
Look out for cars ________ the street.
A. when crossed
B. when crossing
C. if you crossed
D. while you are crossing
A. when crossed
B. when crossing
C. if you crossed
D. while you are crossing
Look out for cars _____ the street.
A. when crossed B. when crossing
C. if you crossed D. while you were crossing
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