单项选择题


A．showed
B．told
C．tended
D．discovered
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单项选择题
A．ought toB．mayC．mustD．have to
A．ought to
B．may
C．must
D．have to
单项选择题
A．go back toB．go on withC．go over and overD．stand by
A．go back to
B．go on with
C．go over and over
D．stand by
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