单项选择题


A．changed
B．carried
C．moved
D．took
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单项选择题
A．couldn'tB．wouldn'tC．needn'tD．shouldn't
A．couldn't
B．wouldn't
C．needn't
D．shouldn't
单项选择题
A．mustB．had toC．shouldD．ought
A．must
B．had to
C．should
D．ought
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