问题
                    
Keep the machine _______, and you will know how it works.
                            A:stop having
B:to stop having
C:stop to have
D:to stop to have;
                        
                        B:to stop having
C:stop to have
D:to stop to have;
正确答案是:
                        
                        
                        
                    同类题型
                    Few people paid full attention to their healthconditions ________ they were seriously ill
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is itfrom here to the station —It’s about three miles from here.
___we have satisfied you, you have no grounds of complaint
Did you attend the meeting— I would have known the news if I___ it.