问题
                    
This problem is too difficult. — You can’t work out the math problem unless you ______ to your teacher carefully. [ ]
                            A: will listen 
B: listen
C: won't listen
D: don't listen
                        
                        B: listen
C: won't listen
D: don't listen
正确答案是:
                        
                        
                        
                    同类题型
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