单项选择题
A.在学习中取得大的进步之前只有刻苦学习。 B.不下苦工夫是不能在学习上取得大的进步的。 C.谁肯下苦工夫,谁就能在学习上取得大的进步。 D.必须勤学苦练,才能在学习上取得大的进步。
A.didn't hear B.hasn't been hearing C.hasn't heard D.hadn't heard
A.out of work B.out of stock C.out of practice D.out of reach