问题
                    
The scientist has made quite a few discoveries, ______ of great importance to the whole world.
                            A:which I think they are
B:which I think are
C:I think which are
D:that I think they are
                        
                        B:which I think are
C:I think which are
D:that I think they are
正确答案是:
                        
                        
                        
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