She worked very hard. She couldn't please her step mother

uments will them in this station.
49. She worked very hard. She couldn't please her step mother.
A She worked very hard in order to please her step mother.
B. Although she worked hard, she could not please her step mother.
C. She worked very hard, so that she could please her step mother.
D. Unless she worked very hard, she could please her step mother.
50. He tries to practise English everyday. He can speak English more fluently now.
A. If he didn't try to practise English everyday, he couldn't speak English more fluently now.
B. If he had not tried to practise English everyday, he couldn't have spoken English more fluently
C. If he tried to practise English everyday, he could speak English more fluently
D. If he tries to practise English everyday, he cannot speak English more fluently now.
now.