单项选择题

The lecturer explained the Water Gate scandal vigorously ______ and every student was attracted by his detailed and vivid presentation.

A．at length
B．lengthily
C．at last
D．at all
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单项选择题
A．commonB．averageC．ordinaryD．popular
A．common
B．average
C．ordinary
D．popular
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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