1-- 'At' is a preposition of location, not direction, but 'come' is a verb of motion/direction. 2-- Because there is no doctor present.
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Anonymous1. We can come home __ dinner.
(A) on (B) for (C) to (D) at
? the correct answer is "B" , but why I can't choose "D" ??
The reason is, each prep. has a specific meeting.
Come home