题目内容
【题目】The fire started on the second floor and it wasn't long ______ the whole building was burned down.
A.while
B.when
C.after
D.before
【答案】D
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题目内容
【题目】The fire started on the second floor and it wasn't long ______ the whole building was burned down.
A.while
B.when
C.after
D.before
【答案】D