单项选择题


A．being thrown
B．throwing
C．thrown
D．threw
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单项选择题
A．doneB．having doneC．having been doneD．being done
A．done
B．having done
C．having been done
D．being done
单项选择题
A．collapsingB．fallingC．slippingD．dropping
A．collapsing
B．falling
C．slipping
D．dropping
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