_____ he was riding ro school,he was hit by a car this morning.A)Until B)Before C)After D)When

_____ he was riding ro school,he was hit by a car this morning.A)Until B)Before C)After D)When

题目

_____ he was riding ro school,he was hit by a car this morning.A)Until B)Before C)After D)When

答案

D
when...当.时候
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