单项选择题


A．learning
B．scanning
C．listening to
D．understanding
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单项选择题
A．may be whichB．may be thatC．must be whatD．may be all
A．may be which
B．may be that
C．must be what
D．may be all
单项选择题
A．wonderB．widenC．wanderD．concentrate
A．wonder
B．widen
C．wander
D．concentrate
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