because he ----- his work well,he was fired by the managerA.hadn't been doneB.hadn't been doing对语法概念很了解的朋友请解释一下,选哪个,为什么

because he failed his math test 急用! He looked worried because his son (miss) because he was ill可以换成because his illnesses吗 because he is ill同义句 because ___ his ___ He failed his math examination because of his careless.改错! Tom looks_(unlike)his father because he is his son. he couldn't move his legs,because his legs (hurt) his mother was .because he did not finish his homework He'll succeed because .He is always at his books he'll succeed because he's always at his books 找错误He hurted his hand because he was careless he hurt his arm () accidents.A because he has B because of an C because D because of he is very happy because it's his birthday 对because it's his birthday 提问 he is unhappy,because he lost his favouritehe is unhappy,because he lost his favourite toy.(改错） he,favorite,summer,likes,because,season,his,is,swiming He is pretty h because of his good eating habits Peter ______ (can)finsh his work,because he was ill His mother is_____(worry),because he is ill .理由