问题
                    
-Look!Everything here is under construction.-Oh,has the building once _________ for exhibition been pulled down, too
                            A:keep
B:been built
C:to be built
D:built
                        
                        B:been built
C:to be built
D:built
正确答案是:
                        
                        
                        
                    同类题型
                    ____that in spite of the rare disease, hemanaged to live as rich and full a life as we do
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