It must have dropped out when he opened the door to look at you.

可能是在打开车门看你时，掉下来的。

youdao

If I had known it was you, I would have opened the door.

要是知道是你们，我早就开门了。

youdao

If I had known it was you, I would have opened the door.

要是知道是你们，我早就开门了。

youdao