21.my sister has been studying for a test____a week.A.in B.since C.before D.for

Well,my sister has a great sports ( ). my sister has long hair 一般疑问句 my sister has long legs 一般疑问句 my sister seldom has breakfast at home my sister has a dog.改成疑问句 my sister has a dog.改成疑问句 My sister has and healthy lifestyle 同义 my sister has black eyes?对my提问 My sister has read the magazine 改为否定句 My sister read the magazine My sister has some friends in school 改为否定句 My sister has a round face.改为一般疑问句 My sister usually has lunch at home.(改为一般疑问句) has,sister,big,round,my,eyes,baby连词成句 改错：My elder sister has studies physics since eight months My sister has wery l( )hair and s( )eyes 用has,lots,red,my,clothes,of,sister造句 My sister has two skirts ,One is yellow ,____is balck. my sister has long legs 改为一般疑问句