单项选择题

The duties of the secretary are to receive visitors, ______.

A．opening the mail, types letters
B．to open the mail and to type letters
C．to open the mail and to type letters
D．opening the mail type letters
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Seldom ______ any mistakes during my past five years of service here.
A．I did make
B．did I make
C．would I make
D．I would make
单项选择题
Everyone was in ______ places when the teacher came into the classroom.
A．hers
B．his
C．one's
D．their
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