问题
                    
The work is really very difficult; _________ it’s very interesting.[ ]
                            A: yet
B: however
C: still
D: at the some time
                        
                        B: however
C: still
D: at the some time
正确答案是:
                        
                        
                        
                    同类题型
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We consider ____ absolutely necessary that we should open our door to the outside world.