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                题目内容
                (国家开放大学英语语法)
            
            
                It looks __________ it is going to rain. What are the   incorrect choices? 
A.that
B.as
C.as if
D.on
                    
                    
                    
                
                
                
            
        A.that
B.as
C.as if
D.on
参考答案