问题补充:
I had been puzzled over the problem for over an hour without any result, all at once the solution flashed across my mind.
A. while
B. when
C. then
D. as
答案:
A. while
(答案→)B. when
C. then
D. as
解析:可联系答.案.网客服索取。
时间:2019-11-01 18:10:07
I had been puzzled over the problem for over an hour without any result, all at once the solution flashed across my mind.
A. while
B. when
C. then
D. as
A. while
(答案→)B. when
C. then
D. as
解析:可联系答.案.网客服索取。