单项选择题


A．so
B．note
C．such
D．listening
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单项选择题
A．learningB．scanningC．listening toD．understanding
A．learning
B．scanning
C．listening to
D．understanding
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
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