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问题: 英语选择题

The boy was playing with a toy car when his mother 横线 from the supermaket.
A.came B. is coming c.was coming d.went

解答:

本题选A
When 在这里表示“突然”的 意思 ,而此时 一般主句为过去进行时,从句为 一般过去时

The boy was playing with a toy car(主句) when his mother came from the supermaket.(从句)
当这个男孩正在玩玩具汽车时,他妈妈突然从超市回来了。