单项选择题

A．first
B．last
C．long
D．next
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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．BeforeB．SinceC．WhileD．When
A．Before
B．Since
C．While
D．When
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