问题
                    
Will you compete ______ the race? [ ]
                            A: in 
B: at
C: on
D:of
                        
                        B: at
C: on
D:of
正确答案是:
                        
                        
                        
                    同类题型
                    Look! There is a big bird__________the tree.[ ]
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The plan for the new design occurred to Mr. Smith______on his work recently.
Oh, it’s you, Ella! Your voice sounds very different _____ the phone. What’s happening?[ ]