请教英语高手：1.My sister is good at (_),这里面为什么要填 boating,而不填play computer
或 flies a kite或 to draw pictures
2. () she is at home. 为什么要填 maybe 而不填 maybe
3.Are they going to have a field reip tomorrow ?(_)为什么填 yes, they are 不填No,they don not


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