问题补充:
—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:
A. if; since
B. whether; but
(答案→)C. if; unless
D. because; until
解析: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。