He is good at maths and it won’t be long he works out the problem.A. sinceB. untilC. befo

发布时间：2020-08-16 11:51:52


He is good at maths and it won’t be long      he works out the problem.
A. since
B. until
C. before
D. when

网友回答

A. since
B. until
(答案→)C. before
D. when
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！