用所给单词的适当形式填空:My brother______(study)in Yuhong Primary School
用所给单词的适当形式填空: My brother______(study)in Yuhong Primary School when he was 10 years old. Last month I ______(learn)how to swim. We must______(learn)from the great people. ( )My mother tells me to practice______the piano for two hours a day. A.to play B.play C.playing D.played ( )I'm sorry to keep you_______for such a long time. A.to wait B.waiting C.waited D.wait 最好能解释、分析原因.