He is writing a report _____ giant pandas for the club newsletter.A.on B.about请问为什么不用B?

He is writing a letter被动语态 He is writing a letter____the corner. He is writing a letter.（对a letter提问） He is writing a letter in his study. （否定） Look!He is writing very______.A goodB wellC fineD nice he is busy writing something on a pice of paper. he is writing a book .（改为一般疑问句） He is writing a good booK变被动语态 he is writing a book改为一般疑问句 he is writing () his notebook. he,is,report,writing,a,he,no,is,not这几个如何组成一句话 He is writing a poetcard .(改为否定句）He _______ _______ a postcard ( ) Is he surfing the internrt? No,he's_______music. A.write B.writing C.writes 选择题,速度 Mr.Smith ________ short stories,but he ________ a TV play these days.A.is writing … is writing B.is writing … writes C.writes … is writing Mr Lin is good at writing ______ drawing.He is a writer and swimming. The writer is in the room,he is writing a letter的合并句 look he is （writing） a letter to hislook he is （writing） a letter to his mother这句话为什么添加ing,急, He is writing aletter翻译,急