单项选择题

If you are constantly looking back,______pretty good you will fall into a hole ahead.

A．it is
B．there is
C．chances are
D．possibilities are
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单项选择题
I'm afraid the coffee I spilt will make a ______on the tablecloth.
A．mark
B．speckle
C．stain
D．dot
单项选择题
The valuable curiosity he bought turns out to be fake for it does not ______ ciose examination.
A．pat up
B．stand up
C．set up
D．look up
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