初中英语题用所给单词的适当形式填空1. I heard him_____(play)the piano when I p
初中英语题 用所给单词的适当形式填空 1. I heard him_____(play)the piano when I passed by his window. 2. The teacher often asks us to d____problems in groups in class. 3. He f___many times,but he didn't give up(放弃). 请做出解释。谢谢!
1. I heard him__playing___(play)the piano when I passed by his window. 2. The teacher often asks us to d_iscuss___problems in groups in class. 3. He failed___many times,but he didn't give up(放弃