单项选择题

Some tribes______with their cattle in search of fresh grass.

A．immigrate
B．migrate
C．emigrate
D．transfer
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单项选择题
[f]and[v]can be distinguished by______.
A．manner of articulation
B．place of articulation
C．vibration of the vocal cords
D．aspiration of articulation
单项选择题
_____your valuable help, we couldn’t have finished the experiment ahead of time.
A．If it were not for
B．Had it not been for
C．Were it not for
D．If it has not been for
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