- Can you describe it happened? - Yes, I was riding on my bike a car knocked me down from behind.A. when; as B. how; as C. how; when D.——青夏教育精英家教网—

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— Can you describe _____ it happened? 　
— Yes, I was riding on my bike _____ a car knocked me down from behind.

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B. how; as　　　
C. how; when 　　
D. how; while

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B. when　　　
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The plan was in ______ just because people were unwilling to cooperate.

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