单项选择题


A．ought to
B．may
C．must
D．have to
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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
单项选择题
A．indifferentB．difficultC．impossibleD．possible
A．indifferent
B．difficult
C．impossible
D．possible
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