单项选择题

22（）

A．the
B．others'
C．others
D．all other

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单项选择题
21（）

A．who
B．that who
C．that those
D．that those who
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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