单项选择题


A．couldn't
B．wouldn't
C．mustn't
D．shouldn't
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单项选择题
A．onB．aboutC．atD．with
A．on
B．about
C．at
D．with
单项选择题
A．dissatisfiedB．unsatisfactoryC．satisfiedD．satisfactory
A．dissatisfied
B．unsatisfactory
C．satisfied
D．satisfactory
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