问题
选择题
I will go for a picnic with my friends on Sunday ________ it rains. [ ]
A. if
B. unless
C. when
D. while
答案
答案：B
搜题请搜索小程序“爱下问搜题”
I will go for a picnic with my friends on Sunday ________ it rains. [ ]
A. if
B. unless
C. when
D. while
答案：B