单项选择题

My boss asked me to answer the phone, to take all messages, and（）some letters.

A．to type
B．typing
C．type
D．typewrite

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单项选择题
She was so stubborn that she never listens to the advice（）to her.

A．that I give it
B．which I give
C．what I give
D．I give it
单项选择题
We（）on it for many hours but we have not yet reached any conclusion.

A．work
B．have been worked
C．have been working
D．are working
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