单项选择题

Unlike watching TV, reading is a highly active process, ______ attention as well as memory and imagination.

A．requires
B．requiring
C．to require
D．required
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单项选择题
Are you going to sit here and ______ a vegetarian from the United States required.
A．watch it happen
B．watch it to happen
C．watching it happen
D．watching it to happen
单项选择题
It's the sort of work that ______ a high level of concentration.
A．calls for
B．makes up
C．lies in
D．stands for
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