[ ]The happy student was singing _____ he was walking.A. until B. as C. since D. and
[ ]The happy student was singing _____ he was walking.
A、 until
B、 as
C、 since
D、 and
发布时间:2025-07-27 14:36:44
[ ]The happy student was singing _____ he was walking.
A、 until
B、 as
C、 since
D、 and