----Did you call Sara back ?
----I didn’t need to , we’ll have a meeting together tonight.
A. though .
B. unless
C. because
D. if
网友回答
A. though .
B. unless
(答案→)C. because
D. if
解析：连词辨析。Though虽然，尽管；unless除非；because因为；if是否，如果。句意：你喊萨拉回来了吗？——我不必。因为我们今晚一起有个会议。故选C。