单项选择题


A．that
B．it
C．one
D．itself
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单项选择题
A．graduallyB．immediatelyC．successfullyD．usually
A．gradually
B．immediately
C．successfully
D．usually
单项选择题
A．came backB．came onC．waved backD．waved on
A．came back
B．came on
C．waved back
D．waved on
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