He has a stomach ache 和 He has flu 为什么一个有A一个没有A

He has a stomach ache 和 He has flu 为什么一个有A一个没有A He has ( ) stomach-ache He has flu.和He has a toothache.这两句话一个他得了流感,一个是他牙痛.为什么flu不要用a he has flu说成he has a flu行吗? George has a stomach ache.He must____an aspirin.A.take B.cal he usually has a stomach-ache（改为否定句） he_________u He has a flu .哪里错了? ____ he have a stomach ache?A.Is B.A He also has got a brother.和He has also got a brother.哪个对?为什么 He has a ______car. He has a computer he has become a