单项选择题

America will never again have as a nation the spirit of adventure as it ______ before the West was settled.

A．could
B．did
C．would
D．was
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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
单项选择题
He’’s______ as a bellyacher -- he’’ s always complaining about something.
A．who is known
B．whom is known
C．what is known
D．which is known
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