单项选择题

He'd better resign from his post, ______

A．wouldn't he
B．shouldn't he
C．couldn't he
D．hadn't he
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单项选择题
I, who can wage war successfully with the 13ugest beasts, should ______ myself from this spider, the most inconsiderable of insects.
A．fade
B．vanish
C．disappear
D．perish
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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