问题
                    
How did the accident happen?— You know, it difficult to see the road clearly because it .
                            A:is…was raining
B:was…had rained
C:is…is raining
D:was…was raining
                        
                        B:was…had rained
C:is…is raining
D:was…was raining
正确答案是:
                        
                        
                        
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