单项选择题
Our country has grown rich because of its ______ with other nations.
A．commerce
B．commerces
C．commercial
D．commercials
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单项选择题
He signed his name ______ two witnesses.
A．at the presence of
B．at the present with
C．in the presence of
D．in the present with
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单项选择题
She is not accustomed to ______ what to do.
A．telling
B．being told
C．having told
D．tell
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