问题
选择题
—Would you like to play tennis with me _________ it doesn’t rain tomorrow?
—Sure, _________ I am busy.
A．if; since
B．whether; but
C．if; unless
D．because; until
答案
答案：C
题目分析：句意：如果明天不下雨，你愿意和我一起打网球吗？当然，除非我忙。If如果，since自从，既然，由于；whether是否；but但是；unless除非；until直到。所以选C。