单项选择题


A．in chance
B．accidentally
C．by incident
D．unbelievably
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单项选择题
A．was the new explosiveB．the new explosive wasC．was new explosiveD．new explosive was
A．was the new explosive
B．the new explosive was
C．was new explosive
D．new explosive was
单项选择题
A．whenB．asC．thenD．while
A．when
B．as
C．then
D．while
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