单项选择题

The discovery of the halftone process in photography in 1881 made it ______ photographs in books and newspapers.

A．the possible reproduction
B．the possibility of reproducing
C．possible to reproduce
D．possibly reproduced
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单项选择题
The problem has been ______ my mind all day.
A．preying on
B．getting at
C．taking on
D．seeing to
单项选择题
It was ______ for him to wear a T-shirt at the reception.
A．out of place
B．out of question
C．out of order
D．out of practice
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