David worked hard at his lessons he gained high grades in the exams.A. so thatB. in order

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。