问题补充:
We were about to leave the classroom it began to rain.
A. while
B. when
C. as
D. before
答案:
A. while
(答案→)B. when
C. as
D. before
解析:be about to do sth. when …正要干某事,这时…。
时间:2020-05-06 06:05:03
We were about to leave the classroom it began to rain.
A. while
B. when
C. as
D. before
A. while
(答案→)B. when
C. as
D. before
解析:be about to do sth. when …正要干某事,这时…。