你好,我認(rèn)為應(yīng)該選rains .意思為“好主意,除非下雨（就不去了）”.
Unless: conj. 除非, 如果不
unless是從屬連詞,引導(dǎo)條件狀語從句,含有否定意義,相當(dāng)于if條件狀語從句的否定形式.所以unless = if not.注意：unless引導(dǎo)的條件狀語從句和if條件狀語從句,與其它時(shí)間狀語從句一樣,用一般現(xiàn)在時(shí)代替將來時(shí).
1. Unless you take more care, you’ll have an accident.
(如果不多加小心的話,你會出事故的.)
2. My baby sister never cries unless she is hungry.
(我那剛出生的妹妹除非餓了,否則她是從來不哭的.)
3. Unless bad weather stops me, I jog every day.
(除非壞天氣阻攔我,否則每天我都慢跑的.)