单项选择题


A．things
B．purposes
C．causes
D．reasons
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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
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
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