单项选择题

A．step across
B．step out onto
C．step along
D．step on
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单项选择题
A．forB．byC．throughD．from
A．for
B．by
C．through
D．from
单项选择题
A．being thrownB．throwingC．thrownD．threw
A．being thrown
B．throwing
C．thrown
D．threw
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