单项选择题

A．was the new explosive
B．the new explosive was
C．was new explosive
D．new explosive was
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单项选择题
A．explodedB．opened upC．dug outD．explored
A．exploded
B．opened up
C．dug out
D．explored
单项选择题
A．buildingB．structureC．mixingD．manufacture
A．building
B．structure
C．mixing
D．manufacture
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