句型转换*Z6h7e3k/{1X5r,M1j6a/h
His little sister did her homework and washed the clothes last night. （改为否定句）*Z6h7e3k/{1X5r,M1j6a/h
*I3X2z)E,K6q:r.p2W+D6U3O*d1j*]8@)}:B*Z6h7e3k/{1X5r,M1j6a/h