单项选择题

A．It
B．There
C．This
D．Which
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单项选择题
A．in chanceB．accidentallyC．by incidentD．unbelievably
A．in chance
B．accidentally
C．by incident
D．unbelievably
单项选择题
A．explodedB．opened upC．dug outD．explored
A．exploded
B．opened up
C．dug out
D．explored
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