单项选择题

It's really a difficult problem to ______.

A．look at
B．make out
C．deal with
D．dwell on
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单项选择题
What occurs when a design has been drawn on a flat surface with a special grease crayon and to which( the surface)water and then ink are applied
A．The ink adheres to the crayon image and is repelled by the moist areas.
B．The ink adheres to the moist areas and is repelled by the crayon image.
C．The water adheres to the crayon image and is repelled by the moist areas.
D．Both ink and water are repelled by the crayon imag
单项选择题
Because the rooms ______ ,we have not moved in yet.
A．are being painted
B．were painted
C．have been painted
D．having painted
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