题目内容
?What happened to Paul?
?He was crossing the street _______ a motor-bike hit him from behind.
A. while
B. when
C. until
D. because
答案:B
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题目内容
?What happened to Paul?
?He was crossing the street _______ a motor-bike hit him from behind.
A. while
B. when
C. until
D. because