ever和once?If you're_____in spain,do come and see me.A everB once.\选哪个呢?

ever和once?If you're_____in spain,do come and see me.A everB once.\选哪个呢?
ever和once?
If you're_____in spain,do come and see me.
A ever
B once.\
选哪个呢?

ever和once?If you're_____in spain,do come and see me.A everB once.\选哪个呢?
错,用ever, 如果你到西班牙,一定来看我.
也可以说once you are in Spain, do come and see me.

hi:
用once, 意思是：一旦
一旦你在西班牙，一定过来看我。
tks~