【单选题】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
                
							【单选题】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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