单项选择题

You_________Mark anything. It was none of his business.

A．needn’’t have told
B．needn’’t tell
C．mustn’’t have told
D．mustn’’t tell
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单项选择题
Do what you think is right,______ they say.
A．however
B．no matter how
C．whichever
D．whatever
单项选择题
A．unlessB．ifC．asD．since
A．unless
B．if
C．as
D．since
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