we must teach the children to use the zebra crossing when ( ) across the streetA,go B,going 选哪个,说明原因

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we must teach the children to use the zebra crossing when ( ) across the streetA,go B,going 选哪个,说明原因
we must teach the children to use the zebra crossing when ( ) across the street
A,go B,going 选哪个,说明原因

we must teach the children to use the zebra crossing when ( ) across the streetA,go B,going 选哪个,说明原因
B 动名词做主语 必须注意 看这个词作的什么成分
这里going做主语

B,going 表示正在发生的动作,go缺主语

B 当时间状语从句的主语和主语一致时,从句中可以省略重复的主语。

选B, 表示正在发生的动作,
其实是进行时,缩略了主语和助动词,
完整的句子是when (they are )going across the street.

选B

B 选A要主语