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
As a student in that famous school, Henry used to look hurt when （）.

A、 scolded
B、 having scolded
C、 to scold
D、 scolding
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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