单项选择题


A．it
B．they
C．that
D．those
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单项选择题
A．whichB．howC．whatD．when
A．which
B．how
C．what
D．when
单项选择题
A．switchedB．performedC．launchedD．altered
A．switched
B．performed
C．launched
D．altered
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