问题
                    
___________ is known to everyone, the moon travels round the earth once every month.
                            A:It
B:As
C:ThatDWhat
D:What
                        
                        B:As
C:ThatDWhat
D:What
正确答案是:
                         
                        
                        
                    同类题型
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Why ____ to go abroad to study when thereare so many good universities at home
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