单项选择题

We find that some birds ______twice a year between hot and cold countries.

A．transfer
B．migrate
C．commute
D．mobilize
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单项选择题
It’’s high time we ______cutting down the rainforests.
A．stopped
B．had to stop
C．shall stop
D．stop
单项选择题
As the director can’’t come to the reception, I’’m representing the company_______.
A．on his account
B．on his behalf
C．for his part
D．in his interest
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