13. English we must work hard at it.A. So as to masterB. MasteringC. MasteredD. To master

发布时间：2020-08-16 13:04:31


13.      English we must work hard at it.
A. So as to master
B. Mastering
C. Mastered
D. To master

网友回答

A. So as to master
B. Mastering
C. Mastered
(答案→)D. To master
解析：可联系答.案.网客服索取。
以上问题属网友观点，不代表本站立场，仅供参考！