问题
                    
No one knew what becauseof the thick fog.
                            A:he hadhappened
B:had happenedto him
C:had hehappened
D:has happenedto him
                        
                        B:had happenedto him
C:had hehappened
D:has happenedto him
正确答案是:
                         
                        
                        
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