问题
                    
The computers are _____ sale _____ $500! [ ]
                            A: on; for 
B: in; at
C: of; to
D:at; on
                        
                        B: in; at
C: of; to
D:at; on
正确答案是:
                         
                        
                        
                    同类题型
                    Try to guess its meaning when you meet a new word. Don’t _____ your dictionary all the time.
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Did you love your day trip?–Yes,we enjoyed the roller coaster ________of all.
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There is someone knocking at the door.- It ______ be Jimmy, he has gone to ShangHai .