单项选择题

21（）

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

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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
单项选择题
I was pleased ______ you yesterday.
A．to meet
B．haven't met
C．to have met
D．to be meeting
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