问题补充:
David worked hard at his lessons he gained high grades in the exams.
A. so that
B. in order to
C. though
D. because
答案:
(答案→)A. so that
B. in order to
C. though
D. because
解析:句意:David努力学习功课,以便在考试中取得更好的分数。so that以便,表目的。in order to+动词原形;though尽管;because因为。根据句意故选A。