I was____out_____the bell rangA.about to go------whenB.about to go -----whileC.going-----whenD.going----while
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I was____out_____the bell rangA.about to go------whenB.about to go -----whileC.going-----whenD.going----while
I was____out_____the bell rang
A.about to go------when
B.about to go -----while
C.going-----when
D.going----while
I was____out_____the bell rangA.about to go------whenB.about to go -----whileC.going-----whenD.going----while
选 A.about to go------when
固定搭配：be about to do...when ...
所以while是绝对不可以用的
be going to do与be about to do的区别
1.be going to do:
1) 表示将要发生的事情或打算最近要进行的动作.如：
It is going to rain soon.快要下雨了.
2) 在含有条件状语从句的主从复合句中,主句一般不用be going to,而常用will（第一人称用shall）.如：
The football match will be put off if it rains tomorrow.如果明天下雨,足球赛将被推迟举行.
2.be about to do:
1) 表示即将发生的动作,在时间上指最近的将来.如：
The new school year is about to begin.
新学年开学在即.
They is about to leave when they hear a siren screaming behind them.
他们正要离开时,突然听到警报器在背後尖叫起来.
One day,I was about to do some shopping when he telephoned me.
一天,我正要去买东西时,他打电话找我.
2) 在含有be about to do的句子中,不能再加时间状语.如：
Wrong:The medical team is about to start immediately.
Right:The medical team is about to start.医疗队就要出发了.
希望能够帮到你哟
A be about to do就要做什么，常于when 连用，表时：这时
答案选 B. about to go -----while
我正要出去，这时铃就响了。