— What’s your plan for this weekend? — We will go for a picnic by the river it rains.A. u

问题补充：

— What’s your plan for this weekend?

— We will go for a picnic by the river it rains.

A. unless

B. if

C. but

D. because

答案：

(答案→)A. unless

B. if

C. but

D. because

解析：unless除非，如果不；if是否，如果；but但是，可是；because因为；句意：你这个周末的计划是什么？——如果不下雨，我们要去河边野餐。计划语境可知选A。