单项选择题

A．at
B．on
C．for
D．by
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单项选择题
According to the study by Thorpe, a chaffinch reared in isolation after its birth ______.
A．never sings
B．cannot learn songs from other species of birds
C．never sings as well as other chaffinches
D．sings the same song all the time
单项选择题
A．sinceB．althoughC．whenD．that
A．since
B．although
C．when
D．that
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