— What happened to Tom?
— He was crossing the street ____ a motorbike hit him from behind.

A. while　
B. when
C. until
D. because
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科目：初中英語 來源：專項題 題型：單選題

— What happened to Tom?
— He was crossing the street ____ a motorbike hit him from behind.
[     ]
A. while　
B. when
C. until
D. because

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